CN113881935B - Surface rust layer stabilization treating agent for weathering steel based on silane coupling agent, preparation method and use method thereof - Google Patents
Surface rust layer stabilization treating agent for weathering steel based on silane coupling agent, preparation method and use method thereof Download PDFInfo
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- CN113881935B CN113881935B CN202111080510.0A CN202111080510A CN113881935B CN 113881935 B CN113881935 B CN 113881935B CN 202111080510 A CN202111080510 A CN 202111080510A CN 113881935 B CN113881935 B CN 113881935B
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- weathering steel
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- rust layer
- silane coupling
- rust
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- 229910000870 Weathering steel Inorganic materials 0.000 title claims abstract description 146
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 80
- 239000006087 Silane Coupling Agent Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000006641 stabilisation Effects 0.000 title claims description 15
- 238000011105 stabilization Methods 0.000 title claims description 15
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000008367 deionised water Substances 0.000 claims abstract description 33
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 33
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000007062 hydrolysis Effects 0.000 claims abstract description 10
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- 239000003381 stabilizer Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 12
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 claims description 12
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 12
- 239000003921 oil Substances 0.000 claims description 10
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 9
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000295 fuel oil Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 4
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 3
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 claims description 3
- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- 235000002906 tartaric acid Nutrition 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 34
- 230000007797 corrosion Effects 0.000 abstract description 34
- 230000001681 protective effect Effects 0.000 abstract description 20
- 238000007665 sagging Methods 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 abstract description 12
- 238000000576 coating method Methods 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 7
- 230000002265 prevention Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000004381 surface treatment Methods 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 238000003618 dip coating Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 105
- 239000010408 film Substances 0.000 description 22
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 11
- 229910000077 silane Inorganic materials 0.000 description 11
- 229910008051 Si-OH Inorganic materials 0.000 description 7
- 229910006358 Si—OH Inorganic materials 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 7
- 239000012298 atmosphere Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 208000021017 Weight Gain Diseases 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910001868 water Inorganic materials 0.000 description 5
- 230000004584 weight gain Effects 0.000 description 5
- 235000019786 weight gain Nutrition 0.000 description 5
- 229910006540 α-FeOOH Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 235000002639 sodium chloride Nutrition 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000012756 surface treatment agent Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- PEVJCYPAFCUXEZ-UHFFFAOYSA-J dicopper;phosphonato phosphate Chemical compound [Cu+2].[Cu+2].[O-]P([O-])(=O)OP([O-])([O-])=O PEVJCYPAFCUXEZ-UHFFFAOYSA-J 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 2
- 229910006299 γ-FeOOH Inorganic materials 0.000 description 2
- -1 Cl – Chemical class 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910002588 FeOOH Inorganic materials 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910003849 O-Si Inorganic materials 0.000 description 1
- 229910003872 O—Si Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- QFFVPLLCYGOFPU-UHFFFAOYSA-N barium chromate Chemical compound [Ba+2].[O-][Cr]([O-])(=O)=O QFFVPLLCYGOFPU-UHFFFAOYSA-N 0.000 description 1
- 229940083898 barium chromate Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910001325 element alloy Inorganic materials 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- RMBHIVQOFNFWFU-UHFFFAOYSA-N n-[4-[2-(4-morpholin-4-ylanilino)pyrimidin-4-yl]phenyl]acetamide Chemical compound C1=CC(NC(=O)C)=CC=C1C1=CC=NC(NC=2C=CC(=CC=2)N2CCOCC2)=N1 RMBHIVQOFNFWFU-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229910000160 potassium phosphate Inorganic materials 0.000 description 1
- 235000011009 potassium phosphates Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008261 resistance mechanism Effects 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000011684 sodium molybdate Substances 0.000 description 1
- 235000015393 sodium molybdate Nutrition 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/46—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to the technical field of metal corrosion and surface treatment, in particular to a silane coupling agent-based stabilizing treatment agent for rust layers on the surface of weathering steel, a preparation method and a use method thereof, which are suitable for rust liquid sagging prevention and scattering prevention and stable protective rust layer formation promotion in the early stage of weathering steel service. The coating comprises the following components in percentage by mass: 1-50% of silane coupling agent, 1-10% of ethanol, 0.05-0.5% of hydrolysis promoter, 0.5-10% of rust layer stability promoter and the balance of deionized water. When the treating agent is applied to the surface of the weathering steel, one or more of spraying, dip-coating, brush-coating and the like can be adopted. The invention can be used for sagging and scattering prevention treatment of the rust liquid on the surface of the weathering steel and the components thereof in the initial stage of the exposure service in the atmospheric environment, and can accelerate the formation of stable protective rust layers. The treating agent has the advantages of simple formula, low cost of each component, simple preparation process and strong operability.
Description
Technical Field
The invention relates to the technical field of metal corrosion and surface treatment, in particular to a stabilizing treatment agent for a rust layer on the surface of weathering steel based on a silane coupling agent, and a preparation method and a use method thereof.
Background
Weathering steel is referred to by adding small amounts of alloying elements, such as: cu, P, cr, ni percent (total content is not more than 5 percent by weight), so that the low alloy steel has better corrosion resistance than common carbon steel in the atmosphere environment, the atmospheric corrosion resistance of the low alloy steel can be 2 to 8 times that of common carbon steel, and the longer the service time is, the more remarkable the atmospheric corrosion resistance is. The excellent atmospheric corrosion resistance of the weathering steel benefits from the fact that a stable protective rust layer can be generated in the service process, corrosion can be effectively prevented from further happening, so that the weathering steel member is free of coating and exposed to use, a traditional paint coating process is omitted, the later maintenance is free, and the life cycle cost of the weathering steel member is obviously reduced. A large number of coating-free weathering steel bridges are available abroad, and the coating-free weathering steel bridges are almost 1 ten thousand in the United states according to statistics, and a large number of coating-free weathering steel bridges are also built in Japan. It can be seen that the application of weathering steel without coating has become a new trend in the field of foreign steel structure construction.
However, most of the current domestic weather-proof bridge steel is still coated, and the weather-proof steel is coated as common steel in the aspects of building, bridge and vehicle, and the real coating-free weather-proof bridge steel is not popularized in China. The coating-free weather-proof bridge steel is slightly higher than the coated ordinary carbon bridge steel in construction cost, but the later maintenance and operation cost is far lower than that of the coated ordinary carbon bridge steel, and the service life and the manufacturing process have better advantages than those of the traditional ordinary carbon bridge steel. However, weathering steel in a natural atmosphere requires at least 3 years or more to develop a stable protective rust layer on its surface. Before the stable protective rust layer is formed, the phenomena of sagging and scattering of rust liquid and the like often occur on the surface of the weathering steel, so that the consistency of the appearance and the color of the weathering steel member is affected, a certain degree of environmental pollution can be caused, and the weathering steel has become a bottleneck problem for limiting the application of the weathering steel in a coating-free manner. In addition, in a marine atmosphere environment with high salinity settlement (the settlement amount of sea salt particles is more than 0.05mg/dm 2/day), the stable protective rust layer on the surface of the weathering steel needs longer time to form, and is difficult to form, and Cl - and H 2 O are easier to permeate the rust layer, so that the weathering steel matrix is further corroded.
The stabilizing treatment agent film layer of the rust layer on the surface of the weathering steel can prevent Cl - and water from penetrating in the high-salinity atmospheric environment, promote the conversion of the rust layer component of the weathering steel from gamma-FeOOH to alpha-FeOOH, shorten the forming time of the protective rust layer and solve the problem of sagging and scattering of rust liquid. Chinese patent CN103173754a discloses a treatment agent for stabilizing rust layer on surface of weathering steel, which consists of alkyd varnish, copper pyrophosphate, barium chromate, ferric oxide, solvent and dispersant; chinese patent CN111575689a discloses a weathering steel surface stabilizer composed of polyvinyl butyral resin, chromium sulfate, ferric oxide, ferroferric oxide, and solvent. However, the treating agent is an organic solvent coating based on a resin component, and the organic solvent is used in the construction process, so that the cost is high, VOC emission is caused, and the odor is heavy.
Chinese patent CN106835092a discloses a water-based rust layer stabilizer consisting of copper sulfate, ferric sulfate, sodium bisulfate, sodium chloride, ferric oxide, and chromium sulfate. Chinese patent CN103924231a discloses an environment-friendly rust layer stabilizer, which consists of copper pyrophosphate, sodium bisulphite, sodium sulfate, ferric chloride and water. Although such water-based inorganic salt stabilizers spray on the surface of weathering steel to form a protective rust layer, such rust layers are generally not resistant to corrosion by Cl -. Thus, such stabilizers cannot be used in high salinity areas; in addition, the treating agent is generally required to be used after descaling and degreasing, and is not beneficial to outdoor construction of large weather-resistant steel structural members.
Chinese patent CN110093599A adopts water-based acrylic acid as a film forming agent, and a uniform coating is formed on the surface of the weathering steel by adding stabilizing agents nano alpha-FeOOH, nano gamma-FeOOH, nano Fe 3O4, copper sulfate and chromium sulfate, so that the weathering steel substrate is protected from further corrosion and a protective rust layer for promoting the surface stability of the weathering steel is formed. Chinese patent CN111593337a discloses a weathering resistant steel surface stabilizer with excellent performance, which uses aqueous acrylic acid as main film forming agent, sodium nitrate, potassium phosphate, sodium molybdate and ferric hydroxide as auxiliary agent. However, the thin film coating with acrylic acid as a film forming agent is easy to form local corrosion on the surface, which is unfavorable for the formation of the whole protective rust layer on the surface of the weathering steel.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a stabilizing treatment agent for a rust layer on the surface of weathering steel based on a silane coupling agent, and a preparation method and a use method thereof. The treating agent has simple formula and low cost; the preparation process is simple and the operability is strong; the use method is diversified, easy to operate and good in use effect, can be used in a high-salinity sedimentation area, is suitable for surface treatment of sagging and scattering prevention of rust liquid in the initial stage of service in various types of weathering steel atmospheric environments, and can accelerate the formation of stable protective rust layers.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A stabilizing treatment agent for a rust layer on the surface of weathering steel based on a silane coupling agent comprises the following components in percentage by mass: 1-50% of silane coupling agent, 1-10% of absolute ethyl alcohol, 0.05-0.5% of hydrolysis promoter, 0.5-10% of rust layer stabilization promoter and the balance of deionized water.
The silane coupling agent-based stabilizing treatment agent for the rust layer on the surface of the weathering steel is one or more than two of gamma-aminopropyl triethoxysilane, gamma-epoxypropyl trimethoxysilane, gamma-glycidol ether oxypropyl trimethoxysilane or other silane coupling agents or silane coupling agent modified products.
The silane coupling agent-based stabilizing treatment agent for the rust layer on the surface of the weathering steel is one or more than two of sulfuric acid, oxalic acid, tartaric acid or other acids.
The rust layer stabilizing treatment agent based on the silane coupling agent is one or more than two of chromium sulfate, copper sulfate, manganese dioxide or other rust layer stabilizing accelerators.
The stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises, by mass, 20% of the silane coupling agent, 5% of absolute ethyl alcohol, 0.08% of sulfuric acid with the concentration of 0.1mol/L, 3% of chromium sulfate, 5% of copper sulfate and the balance of deionized water.
The preparation method of the silane coupling agent-based stabilizing treatment agent for the rust layer on the surface of the weathering steel comprises the following steps:
(1) Preparing materials according to the components of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent, wherein: the deionized water is divided into two parts, wherein the first part is 20-80% of the total mass of the deionized water, and the rest is the second part;
(2) Putting the absolute ethyl alcohol into a reaction kettle, adding the silane coupling agent into the reaction kettle, and stirring while adding to obtain a solution I;
(3) Regulating the pH value of the first part of deionized water to 3-5 by using the hydrolysis promoter, pouring the first part of deionized water into the solution I, and stirring the solution I at the temperature of 25-35 ℃ for 6-8 hours to obtain a solution A;
(4) Sequentially adding the rust layer stabilizing accelerator into the second part of deionized water under stirring to obtain a solution B;
(5) And uniformly mixing the solution A and the solution B according to the volume ratio of 1:1 to obtain the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent.
According to the preparation method of the silane coupling agent-based stabilizing treatment agent for the rust layer on the surface of the weathering steel, when the solution A and the solution B are respectively clarified, the solution A and the solution B are mixed, and the mixed treatment agent is required to be used within 24 hours.
The use method of the surface rust layer stabilization treatment agent for the weathering steel based on the silane coupling agent adopts any one or more of spraying, dip-coating and brush-coating when the surface treatment agent is applied.
The silane coupling agent-based method for using the stabilizing treatment agent for the rust layer on the surface of the weathering steel is characterized in that the heavy oil is used after the surface of the weathering steel is required to be degreased, and the light oil is directly used on the surface of the weathering steel; after the weathering steel is derusted, a surface treating agent is used, or the weathering steel is rusted; and (3) for the same weathering steel surface, spraying the surface treating agent according to the damage degree of the surface treating agent film and the formation condition of the stabilized rust layer.
According to the application method of the surface rust layer stabilization treatment agent for the weathering steel based on the silane coupling agent, when the surface treatment agent is used for the weathering steel with rust, the surface treatment agent film is dried for 2 hours and is dried for 12 hours at normal temperature, and baking is not needed.
The design idea of the invention is as follows:
(1) And forming a breathable and semi-permeable porous grid barrier coating layer with the thickness of 5-20 mu m (depending on the concentration of silane and the change of spraying times) on the surface of the weathering steel by using a silane coupling agent. The silane film layer can allow proper amount of oxygen and moisture to enter and reach the surface of the weathering steel matrix, allow the weathering steel to corrode at a certain rate to generate free Fe 3+、Fe2+ and oxides, and provide product amount accumulation for the subsequent stable protective rust layer formation.
(2) The silane coupling agent generates a large number of Si-OH bonds after hydrolysis, and partial Si-OH bonds are dehydrated and condensed into a siloxane Si-O-Si structure, so that a silane film is uniformly covered on the surface of the weathering steel; part of Si-OH bonds form hydrogen bonds with hydroxyl groups on the surface of the weathering steel matrix, and the hydrogen bonds are released in a subsequent curing stage, so that Fe-O-Si bonds are formed, and the silane film is firmly bonded on the surface of the weathering steel; the corrosion inhibitor has the advantages that the corrosion inhibitor can absorb free Fe 3+、Fe2+ and oxides generated in the early stage of atmospheric corrosion of the weathering steel and can effectively alleviate and prevent the problems of sagging and scattering of rust liquid in the early stage of service of the weathering steel due to the physical barrier effect of the silane film layer.
(3) Chromium sulfate can promote the formation of a compact inner rust layer on the surface of weathering steel, is favorable for refining alpha-FeOOH grains, and can effectively inhibit the invasion of corrosive anions, particularly Cl –, when the Cr content in the alpha-FeOOH at the interface of a steel substrate/the rust layer exceeds a certain amount, so that the rust layer has ion selectivity; in addition, it is believed by the scholars that Cr 3+ in combination with O 2- together occupy vacancies in the FeO 3(OH)3 octahedral double bonds in the α -FeOOH unit cell, forming iron-chromium multi-element alloy oxides and can be concentrated at microcracks in the rust layer, resulting in enhanced corrosion resistance of the rust layer. Therefore, the chromium sulfate can be used as an accelerator in the stabilizing treatment agent for the surface rust layer of the weathering steel in the marine atmosphere with higher NaCl settlement.
(4) The copper sulfate can promote the anode passivation of the weathering steel to form a rust layer with better protection, and a barrier layer which takes Cu and P as main components can be formed between the substrate and the rust layer, and the barrier layer is firmly combined with the substrate, so that the corrosion-resistant steel has better protection effect; in addition, cu 2+ can be reduced to Cu +,Cu+ during corrosion to replace the regular tetrahedral center Fe (III) in the Fe 3O4 unit cell, so that certain lattice points of the Fe 3O4 particles are negatively charged, and the weathering steel rust layer has the capability of rejecting Cl – from being immersed. Therefore, the copper sulfate can also be used as an accelerator in a stabilizing treatment agent for the surface rust layer of the weathering steel in the marine atmosphere with higher NaCl settlement.
(5) Manganese dioxide is a strong oxidant in an acid medium, can accelerate the conversion of Fe 2+ on the surface of the service weathering steel in the acid industrial polluted atmosphere to Fe 3+ and generate protective oxide, and promotes the formation of a compact inner rust layer; at the same time Mn 4+ is reduced to Mn 2+, exists in the form of MnFe 2O4 and is positioned at the center of an octahedron in a Fe 3O4 unit cell, which is equivalent to replacing Fe (II) in the octahedron, and the existence of Mn (II) has little influence on the generation and stability of the protective component alpha-FeOOH. Thus, manganese dioxide is useful as an accelerator in a treatment agent for stabilizing a rust layer on the surface of a weathering steel in the early stage of service in an industrially polluted atmosphere caused by acid precipitation such as SO 2.
The three promoters are rust layer stabilization promoters related to the embodiment of the application, and it is to be noted that NaNO 2, phosphate, peroxide and the like can be used as rust layer stabilization promoters; in addition, when one or more of the above accelerators are used simultaneously, a certain synergistic effect exists, and the effect is better.
Compared with the prior art, the invention has the advantages that:
(1) The surface treating agent can form a breathable and semi-permeable silane-based Kong Shanzhang coating layer on the surface of weathering steel. The film layer allows a proper amount of oxygen and moisture to enter and reach the surface of the weathering steel substrate, allows the weathering steel to corrode at a certain rate to generate corrosion products, and provides product accumulation for subsequent stable protective rust layer formation.
(2) The surface treating agent has a large amount of unsaturated Si-OH bonds in a silane film layer formed on the surface of the weathering steel, and partial Si-OH bonds are dehydrated and condensed so that the silane film is uniformly covered on the surface of the weathering steel; part of Si-OH bonds form hydrogen bonds with hydroxyl groups on the surface of the weathering steel matrix, so that the silane film is firmly combined on the surface of the weathering steel; the Si-OH bond can adsorb free Fe 3+、Fe2+ and oxide, and the physical barrier effect of the silane film layer can effectively slow down and prevent the problems of rust sagging and scattering in the early service period of the weathering steel.
(3) The surface treating agent can form a silane film layer on the surface of the weathering steel, and can effectively solve the problems of sagging prevention, scattering and the like of rust liquid in the initial service period in the atmospheric environment of the coating-free weathering steel building/component; meanwhile, chromium sulfate, copper sulfate and manganese dioxide rust layer stabilizing accelerator are added into the surface treating agent, so that the formation of a stable protective rust layer on the surface of the weathering steel is accelerated.
(4) The surface treating agent disclosed by the invention is simple in preparation process, strong in operability, suitable for rust liquid sagging prevention and scattering prevention treatment in the initial service period of a coating-free weathering steel building/component atmospheric environment, and excellent in use effect, and does not need to carry out pretreatment such as rust removal, oil removal (heavy oil pollution needs to be manually wiped and removed), high-temperature drying and the like on the surface of the weathering steel during use.
(5) The surface treating agent has good treatment effect, can be suitable for the surface treatment of various types of weathering steel, can be used in high-salinity sedimentation, can effectively alleviate the problems of sagging, scattering and the like of rust liquid of the weathering steel in the initial stage of service, and can accelerate the formation of stable protective rust layers.
Drawings
Fig. 1 is a graph of case 1 treated and untreated weathering steel weight gain after 40 CCTs. In the figure, the ordinate Corrosion rate represents the corrosion rate (mg·cm -2·d-1).
FIG. 2 is a graph of rust that was dropped after weathering steel atmospheric corrosion for 3 months (left untreated, right example 1 treated).
Fig. 3 is a graph of case 2 treated and untreated weathering steel weight gain after 40 CCTs. In the figure, the ordinate Corrosion rate represents the corrosion rate (mg·cm -2·d-1).
FIG. 4 is a graph of rust dripping after weathering steel has been air-corroded for 3 months (left untreated, right example 2 treated).
Fig. 5 is a graph of case 3 treated and untreated weathering steel weight gain after 40 CCTs. In the figure, the ordinate Corrosion rate represents the corrosion rate (mg·cm -2·d-1).
FIG. 6 is a graph of rust dripping after weathering steel has been air-corroded for 3 months (left untreated, right example 3 treated).
Detailed Description
The invention is further illustrated by the following examples.
Example 1
In the embodiment, the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises the following components in percentage by mass: 20% of gamma-aminopropyl triethoxysilane, 5% of absolute ethyl alcohol, 0.08% of sulfuric acid with the concentration of 0.1mol/L, 3% of chromium sulfate and the balance of deionized water.
The preparation method of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises the following steps:
(1) Preparing materials according to the components of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent, wherein: the deionized water is divided into two parts, wherein the first part is 50% of the total mass of the deionized water, and the rest is the second part;
(2) Putting the absolute ethyl alcohol into a reaction kettle, adding the silane coupling agent into the reaction kettle, and stirring while adding to obtain a solution I;
(3) Regulating the pH value of the first part of deionized water to 4 by using sulfuric acid with the concentration of the hydrolysis accelerator of 0.1mol/L, pouring the first part of deionized water into the solution I, and stirring the solution I for 7 hours at the temperature of 30 ℃ to obtain a solution A;
(4) Sequentially adding the rust layer stabilizing accelerator into the second part of deionized water under stirring to obtain a solution B;
(5) And uniformly mixing the solution A and the solution B according to the volume ratio of 1:1 to obtain the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent.
And spraying and brushing are adopted when the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent is applied. The heavy oil stain weathering steel surface is used after oil removal (can be manually wiped for oil removal), the weathering steel is rusted with a treating agent, and the rust layer stabilizer is sprayed on the same weathering steel surface according to the damage degree of the film layer and the rust layer formation condition. And at normal temperature, the film layer of the stabilizing treatment agent for the surface rust layer of the weathering steel based on the silane coupling agent is dried for 2 hours and is dried for 12 hours without baking.
Experimental data of the present example after using the silane coupling agent-based stabilizing agent for rust layer on weathering steel surface are as follows: a dry/wet alternate corrosion test (CCT test method is referred to: hao Long. Corrosion evolution law and corrosion resistance mechanism of MnCu-P/Mo weathering steel: doctor's thesis: liaoning: china academy of sciences metal institute, 2015.) was performed using Na 2SO3 solution to simulate an industrial atmospheric corrosion environment. As shown in FIG. 1, after 40 CCTs, the weight gain of the weathering steel treated and untreated in case 1 (example 1) was 0.6885mg cm -2·d-1 and 0.9314mg cm -2·d-1, respectively.
As shown in FIG. 2, after atmospheric corrosion for 3 months, the rust liquid dropped from the washed untreated weathering steel was pale yellow, the cup bottom had a small amount of rust, and the treated steel was colorless and transparent and had no rust.
The results of the embodiment show that the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent can effectively prevent sagging and scattering of the rust solution of the weathering steel and promote the formation of a stable protective rust layer.
Example 2
In the embodiment, the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises the following components in percentage by mass: 30% of gamma-glycidoxypropyl trimethoxysilane, 2% of absolute ethyl alcohol, 0.3% of sulfuric acid with the concentration of 0.1mol/L, 6% of chromium sulfate and the balance of deionized water.
The preparation method of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises the following steps:
(1) Preparing materials according to the components of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent, wherein: the deionized water is divided into two parts, wherein the first part is 70% of the total mass of the deionized water, and the rest is the second part;
(2) Putting the absolute ethyl alcohol into a reaction kettle, adding the silane coupling agent into the reaction kettle, and stirring while adding to obtain a solution I;
(3) Regulating the pH value of the first part of deionized water to 5 by using sulfuric acid with the concentration of the hydrolysis accelerator of 0.1mol/L, pouring the first part of deionized water into the solution I, and stirring the solution I for 8 hours at the temperature of 35 ℃ to obtain a solution A;
(4) Sequentially adding the rust layer stabilizing accelerator into the second part of deionized water under stirring to obtain a solution B;
(5) And uniformly mixing the solution A and the solution B according to the volume ratio of 1:1 to obtain the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent.
And spraying and brushing are adopted when the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent is applied. The heavy oil stain weathering steel surface is used after oil removal (can be manually wiped for oil removal), the weathering steel is rusted with a treating agent, and the rust layer stabilizer is sprayed on the same weathering steel surface according to the damage degree of the film layer and the rust layer formation condition. And at normal temperature, the film layer of the stabilizing treatment agent for the surface rust layer of the weathering steel based on the silane coupling agent is dried for 2 hours and is dried for 12 hours without baking.
Experimental data of the present example after using the silane coupling agent-based stabilizing agent for rust layer on weathering steel surface are as follows: as shown in fig. 3, after 40 CCTs, the treated and untreated weathering steels with case 2 (example 2) had increased weight of 0.6715mg·cm -2·d-1 and 0.9031mg·cm -2·d-1, respectively, using Na 2SO3 solutions to simulate an industrial atmospheric corrosion environment for dry/wet alternating corrosion tests.
FIG. 4 shows that after atmospheric corrosion for 3 months, the rust liquid dropped from the washed untreated weathering steel was pale yellow, the cup bottom had a small amount of rust, and the treated steel was colorless and transparent and free of rust.
The results of the embodiment show that the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent can effectively prevent sagging and scattering of the rust solution of the weathering steel and promote the formation of a stable protective rust layer.
Example 3
In the embodiment, the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises the following components in percentage by mass: 10% of gamma-epoxypropyl trimethoxy silane, 8% of absolute ethyl alcohol, 0.2% of sulfuric acid with the concentration of 0.1mol/L, 9% of manganese dioxide and the balance of deionized water.
The preparation method of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent comprises the following steps:
(1) Preparing materials according to the components of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent, wherein: the deionized water is divided into two parts, wherein the first part is 30% of the total mass of the deionized water, and the rest is the second part;
(2) Putting the absolute ethyl alcohol into a reaction kettle, adding the silane coupling agent into the reaction kettle, and stirring while adding to obtain a solution I;
(3) Regulating the pH value of the first part of deionized water to 3 by using sulfuric acid with the concentration of the hydrolysis accelerator of 0.1mol/L, pouring the first part of deionized water into the solution I, and stirring the solution I for 6 hours at the temperature of 25 ℃ to obtain a solution A;
(4) Sequentially adding the rust layer stabilizing accelerator into the second part of deionized water under stirring to obtain a solution B;
(5) And uniformly mixing the solution A and the solution B according to the volume ratio of 1:1 to obtain the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent.
And spraying and brushing are adopted when the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent is applied. The heavy oil stain weathering steel surface is used after oil removal (can be manually wiped for oil removal), the weathering steel is rusted with a treating agent, and the rust layer stabilizer is sprayed on the same weathering steel surface according to the damage degree of the film layer and the rust layer formation condition. And at normal temperature, the film layer of the stabilizing treatment agent for the surface rust layer of the weathering steel based on the silane coupling agent is dried for 2 hours and is dried for 12 hours without baking.
Experimental data of the present example after using the silane coupling agent-based stabilizing agent for rust layer on weathering steel surface are as follows: as shown in fig. 5, after 40 CCTs, the treated and untreated weathering steels had weight gains of 0.7005mg·cm -2·d-1 and 0.9214mg·cm -2·d-1, respectively, using Na 2SO3 solutions to simulate an industrial atmospheric corrosion environment for dry/wet alternating corrosion tests.
As shown in FIG. 6, after atmospheric corrosion for 3 months, the rust liquid dropped from the washed untreated weathering steel was pale yellow, the cup bottom had a small amount of rust, and the treated steel was colorless and transparent and had no rust.
The results of the embodiment show that the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent can effectively prevent sagging and scattering of the rust solution of the weathering steel and promote the formation of a stable protective rust layer.
Claims (7)
1. The stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent is characterized by comprising the following components in percentage by mass: 1-50% of silane coupling agent, 1-10% of absolute ethyl alcohol, 0.05-0.5% of hydrolysis promoter, 0.5-10% of rust layer stability promoter and the balance of deionized water;
The silane coupling agent is one or more than two of gamma-aminopropyl triethoxysilane, gamma-epoxypropyl trimethoxysilane and gamma-glycidol ether oxypropyl trimethoxysilane;
The hydrolysis promoter is one or more than two of sulfuric acid, oxalic acid and tartaric acid;
The rust layer stabilizing accelerator is one or more of chromium sulfate, copper sulfate and manganese dioxide.
2. The stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent according to claim 1, wherein the stabilizing treatment agent comprises, by mass, 20% of the silane coupling agent, 5% of absolute ethyl alcohol, 0.08% of sulfuric acid with the concentration of 0.1mol/L, 3% of chromium sulfate, 5% of copper sulfate and the balance of deionized water.
3. A method for preparing the silane coupling agent-based stabilizing agent for the rust layer on the surface of weathering steel according to any one of claims 1 to 2, comprising the steps of:
(1) Preparing materials according to the components of the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent, wherein: the deionized water is divided into two parts, wherein the first part is 20-80% of the total mass of the deionized water, and the rest is the second part;
(2) Putting the absolute ethyl alcohol into a reaction kettle, adding the silane coupling agent into the reaction kettle, and stirring while adding to obtain a solution I;
(3) Regulating the pH value of the first part of deionized water to 3-5 by using the hydrolysis promoter, pouring the first part of deionized water into the solution I, and stirring the solution I at the temperature of 25-35 ℃ for 6-8 hours to obtain a solution A;
(4) Sequentially adding the rust layer stabilizing accelerator into the second part of deionized water under stirring to obtain a solution B;
(5) And uniformly mixing the solution A and the solution B according to the volume ratio of 1:1 to obtain the stabilizing treatment agent for the rust layer on the surface of the weathering steel based on the silane coupling agent.
4. The method for preparing a silane coupling agent-based stabilizing agent for a rust layer on a weathering steel surface according to claim 3, wherein the solution a and the solution B are mixed when they are clarified, respectively, and the mixed agent is used within 24 hours.
5. A method of using the silane coupling agent-based weathering steel surface rust layer stabilization agent of any one of claims 1 to 2, characterized in that any one or two or more of spraying, dipping and brushing are used in applying the weathering steel surface rust layer stabilization agent.
6. The method for using the silane coupling agent-based weathering steel surface rust layer stabilization treatment agent according to claim 5, wherein the heavy oil is used after oil removal, and the light oil is directly used on the weathering steel surface; after the weathering steel is derusted, using a weathering steel surface rust layer stabilization treating agent, or using a weathering steel surface rust layer stabilization treating agent with rust; and (3) for the same surface of the weathering steel, the stabilizing treatment agent for the surface rust layer of the weathering steel is sprayed according to the damage degree of the stabilizing treatment agent film layer for the surface rust layer of the weathering steel and the formation condition of the stabilizing rust layer.
7. The method of using a silane coupling agent-based surface rust stabilization agent for weathering steel according to claim 5, wherein when the surface rust stabilization agent for weathering steel is used for rust, the surface rust stabilization agent film for weathering steel is dried for 2 hours at normal temperature, and is dried for 12 hours without baking.
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| CN113755097A (en) * | 2021-09-15 | 2021-12-07 | 湖南工程学院 | Surface treating agent for slowing down rust liquid sagging of weathering resistant steel at initial service stage as well as preparation method and use method thereof |
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