CN105483590A - Hot-dip galvanizing process for steel member - Google Patents
Hot-dip galvanizing process for steel member Download PDFInfo
- Publication number
- CN105483590A CN105483590A CN201510953160.2A CN201510953160A CN105483590A CN 105483590 A CN105483590 A CN 105483590A CN 201510953160 A CN201510953160 A CN 201510953160A CN 105483590 A CN105483590 A CN 105483590A
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- CN
- China
- Prior art keywords
- plating
- plating piece
- hot
- dip galvanizing
- degreasing
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- Granted
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 21
- 239000010959 steel Substances 0.000 title claims abstract description 21
- 238000005246 galvanizing Methods 0.000 title claims abstract description 15
- 238000007747 plating Methods 0.000 claims abstract description 49
- 238000005238 degreasing Methods 0.000 claims abstract description 18
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000009713 electroplating Methods 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 8
- 229910052738 indium Inorganic materials 0.000 claims description 7
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 7
- 229910052746 lanthanum Inorganic materials 0.000 claims description 7
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- -1 polyoxyethylene Polymers 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 4
- DPDMMXDBJGCCQC-UHFFFAOYSA-N [Na].[Cl] Chemical compound [Na].[Cl] DPDMMXDBJGCCQC-UHFFFAOYSA-N 0.000 claims description 4
- 150000007942 carboxylates Chemical class 0.000 claims description 4
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 4
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 4
- 235000019800 disodium phosphate Nutrition 0.000 claims description 4
- 238000010828 elution Methods 0.000 claims description 4
- 239000011592 zinc chloride Substances 0.000 claims description 4
- 235000005074 zinc chloride Nutrition 0.000 claims description 4
- 108050008598 Phosphoesterases Proteins 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract 2
- 239000011247 coating layer Substances 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003788 bath preparation Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000003245 working effect Effects 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a hot-dip galvanizing process for a steel member. The process comprises the following steps: a plating piece is put into a degreasing fluid with the temperature of 76-85 DEG C, and degreasing is carried out for 10-20 min; after the plating piece is washed with hydrochloric acid for 35-50 min, and then the plating piece is washed with water; the plating piece is put into an assistant plating liquid with the temperature of 85-98 DEG C, and assistant plating is carried out for 50-100 s; after drying is carried out in hot air with the temperature of 100-120 DEG C for 50-80 s, the plating piece is immediately put into an alloy plating solution with the temperature of 455-468 DEG C, and hot dipping is carried out for 60-150 s; and the plating piece is cooled in the air naturally to the room temperature. The hot-dip galvanizing process for the steel member is simple, the galvanized coating layer is uniform, the operation is convenient, and the production cost is reduced; and the plating piece obtained with the process has excellent corrosion resistance, so that the service life of the steel member is prolonged.
Description
Technical field
The invention belongs to galvanizing technical field, specifically a kind of steel beam column hot-dip galvanizing technique.
Background technology
Steel construction under atmospheric environment acts on by sunlight, dust storm, sleet, frost and dew and temperature and humidity change throughout the year, oxygen wherein in air and moisture are the important factors causing outdoor iron structure to corrode, the industrial gasses of corrosion of steel structure are caused to contain SO2, CO2, NO2, CI2, H2S and NH3 etc., although these composition content are very little, but be all very important to the corrosion harmfulness of iron and steel, wherein SO2 has the greatest impact, and CI2 can make metallic surface passivating film be destroyed.These gases are soluble in water in acid, form acid rain, corroding metal facility.
The feature of marine atmosphere is containing a large amount of salt, mainly NaCI, and on the metal surface, the electric action having moisture absorption due to it and increase surperficial liquid film simultaneously CI-itself has again very strong aggressiveness, has thus increased the weight of the corrosion of metallic surface in salt particle sedimentation.Steel construction bank off sea more closely corrodes also more serious, in its etch ratio inland air high times.
Pot galvanize also claims galvanizing, is that steel and iron member immerses a kind of method obtaining metal cladding in the zinc liquid of melting.Develop rapidly with high voltage power transmission, traffic, communication career in recent years, more and more higher to steel part requirement of shelter, pot galvanize demand also constantly increases.
Summary of the invention
The object of the invention is to the defect overcoming prior art existence, a kind of steel beam column hot-dip galvanizing technique is provided.
Object of the present invention can be achieved through the following technical solutions:
A kind of steel beam column hot-dip galvanizing technique, is characterized in that, comprise the steps:
(1) degreasing: degreasing fluid degreasing 10-20min plating piece being placed in 76-85 DEG C;
(2) acid washing: plating piece step (1) obtained adopts salt acid elution plating piece 35-50min after washing;
(3) plating is helped: the quickening liquid plating piece that step (2) obtains being placed in 85-98 DEG C helps plating 50-100s, and wherein quickening liquid formula is: ammonia chloride 100-120g/L, zinc chloride 5-8g/L, sodium-chlor 10-20g/L, and surplus is water;
(4) hot dip process: plating piece step (3) obtained is placed in the alloy electroplating bath hot dip process 60-150s of 455-468 DEG C immediately in 100-120 DEG C of warm air after dry 50-80s, wherein alloy electroplating bath weight percent consist of aluminium 0.1-0.5%, magnesium 1-3%, indium 0.002-0.01%, lanthanum 0.1-0.5%, surplus is zinc;
(5) cool: the plating piece that step (4) obtains is naturally cooled to room temperature in atmosphere.
As preferred further, in step of the present invention (1), the formula of degreasing fluid is: Sodium phosphate dibasic 15-30g/L, sodium hydroxide 50-60g/L, phosphoesterase 30 .5-1g/L, polyoxyethylene carboxylate 1-3g/L, surplus are water.
As preferred further, help plating temperature to be 90 DEG C in step of the present invention (3), help the plating time to be 80s.
In present invention process, the formula of alloy electroplating bath is particularly important, directly affects the quality of plating piece coating.
The bright property of hot galvanized layer can be significantly improved when adding the aluminium of 0.005-0.02% in alloy electroplating bath, reduce zinc liquid surface oxidation, when being added beyond the aluminium of 0.15% in zinc liquid, can suppress the formation of Fe-Zn alloy phase and obtain the coating of appropriate thickness, good adhesion, the present invention selects aluminium content to be 0.1-0.5%.
Indium and lanthanum are rare earth element, because rare earth has outstanding chemically reactive and very strong avidity, can greatly reduce zinc-aluminium melting viscosity, improve zinc liquid mobility, thus improve even zinc layer.
Beneficial effect of the present invention: steel beam column hot-dip galvanizing technique of the present invention is simple, zinc coating is even, easy to operate, reduces production cost; The plating piece utilizing present invention process to obtain has good antiseptic property, extends the work-ing life of steel beam column.
Embodiment
If no special instructions, the present invention " % " is all weight percentage.
Embodiment 1
A kind of steel beam column hot-dip galvanizing technique, comprises the steps:
1, degreasing: degreasing fluid degreasing 15min plating piece being placed in 80 DEG C, wherein the formula of degreasing fluid is: Sodium phosphate dibasic 20g/L, sodium hydroxide 56g/L, phosphoric acid ester 1g/L, polyoxyethylene carboxylate 2g/L, surplus are water.
2, acid washing: wash after plating piece obtained above being adopted salt acid elution plating piece 45min.
3, plating is helped: quickening liquid plating piece obtained above being placed in 90 DEG C helps plating 80s, and wherein quickening liquid formula is: ammonia chloride 110g/L, zinc chloride 6.5g/L, sodium-chlor 20g/L, and surplus is water.
4, hot dip process: alloy electroplating bath hot dip process 100s plating piece obtained above being placed in 110 DEG C of warm airs 460 DEG C after dry 60s immediately, wherein the weight percent of alloy electroplating bath consists of aluminium 0.3%, magnesium 2%, indium 0.006%, lanthanum 0.3%, and surplus is zinc.
Alloy electroplating bath preparation method is: by aluminium 0.3%, magnesium 2%, indium 0.006%, lanthanum 0.3%, and surplus is that zinc carries out melting, namely obtains alloy electroplating bath.
5, cool: plating piece obtained above naturally cools to room temperature in atmosphere.
Embodiment 2
A kind of steel beam column hot-dip galvanizing technique, comprises the steps:
1, the degreasing of plating piece: degreasing fluid degreasing 12min plating piece being placed in 85 DEG C, wherein the formula of degreasing fluid is: Sodium phosphate dibasic 30g/L, sodium hydroxide 50g/L, phosphoesterase 30 .5g/L, polyoxyethylene carboxylate 3g/L, surplus are water.
2, acid washing: plating piece obtained above is adopted salt acid elution plating piece 40min after washing.
3, plating is helped: quickening liquid plating piece obtained above being placed in 98 DEG C helps plating 60s, and wherein quickening liquid formula is: ammonia chloride 100g/L, zinc chloride 8g/L, sodium-chlor 20g/L, and surplus is water.
4, hot dip process: alloy electroplating bath hot dip process 70s plating piece obtained above being placed in 120 DEG C of warm airs 468 DEG C after dry 50s immediately, wherein the weight percent of alloy electroplating bath consists of aluminium 0.5%, magnesium 3%, indium 0.01%, lanthanum 0.4%, and surplus is zinc.
Alloy electroplating bath preparation method: by aluminium 0.5%, magnesium 3%, indium 0.01%, lanthanum 0.4%, surplus is that zinc carries out melting, namely obtains alloy electroplating bath.
5, cool: plating piece obtained above is naturally cooled to room temperature in atmosphere.
Claims (3)
1. a steel beam column hot-dip galvanizing technique, is characterized in that, comprises the steps:
(1) degreasing: degreasing fluid degreasing 10-20min plating piece being placed in 76-85 DEG C;
(2) acid washing: plating piece step (1) obtained adopts salt acid elution plating piece 35-50min after washing;
(3) plating is helped: the quickening liquid plating piece that step (2) obtains being placed in 85-98 DEG C helps plating 50-100s, and wherein quickening liquid formula is: ammonia chloride 100-120g/L, zinc chloride 5-8g/L, sodium-chlor 10-20g/L, and surplus is water;
(4) hot dip process: plating piece step (3) obtained is placed in the alloy electroplating bath hot dip process 60-150s of 455-468 DEG C immediately in 100-120 DEG C of warm air after dry 50-80s, wherein the weight percent of alloy electroplating bath consists of aluminium 0.1-0.5%, magnesium 1-3%, indium 0.002-0.01%, lanthanum 0.1-0.5%, and surplus is zinc;
(5) cool: the plating piece that step (4) obtains is naturally cooled to room temperature in atmosphere.
2. a kind of steel beam column hot-dip galvanizing technique according to claim 1, it is characterized in that, in described step (1), the formula of degreasing fluid is: Sodium phosphate dibasic 15-30g/L, sodium hydroxide 50-60g/L, phosphoesterase 30 .5-1g/L, polyoxyethylene carboxylate 1-3g/L, surplus are water.
3. a kind of steel beam column hot-dip galvanizing technique according to claim 1, is characterized in that, helps plating temperature to be 90 DEG C, help the plating time to be 80s in described step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510953160.2A CN105483590B (en) | 2015-12-20 | 2015-12-20 | A kind of steel member hot-dip galvanizing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510953160.2A CN105483590B (en) | 2015-12-20 | 2015-12-20 | A kind of steel member hot-dip galvanizing technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105483590A true CN105483590A (en) | 2016-04-13 |
| CN105483590B CN105483590B (en) | 2018-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510953160.2A Active CN105483590B (en) | 2015-12-20 | 2015-12-20 | A kind of steel member hot-dip galvanizing technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105483590B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108796416A (en) * | 2018-08-17 | 2018-11-13 | 南京力同重工机械有限公司 | A kind of galvanized method of steel member |
| CN110106460A (en) * | 2019-05-21 | 2019-08-09 | 安徽伟宏钢结构集团股份有限公司 | A kind of continuous operation steel member hot-dip galvanizing technique |
| CN111719072A (en) * | 2020-07-28 | 2020-09-29 | 惠博新型材料有限公司 | Zn-Al-Si-Mn-Bi-Ti-Ce alloy for hot dip coating and use method thereof |
| CN114807812A (en) * | 2022-04-24 | 2022-07-29 | 上海聚丰热镀锌有限公司 | Hot-dip galvanizing process for metal plated part |
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| CN101368139A (en) * | 2007-08-15 | 2009-02-18 | 江苏海迅实业集团股份有限公司 | Laboratory glassware detergent |
| CN103160765A (en) * | 2013-02-20 | 2013-06-19 | 国网智能电网研究院 | Electric transmission line steel member hot-dip galvanizing alloy clad layer and preparation technology thereof |
| CN103589981A (en) * | 2013-11-13 | 2014-02-19 | 常熟市宝华建筑装璜材料有限公司 | Formula of hot galvanizing plating auxiliary |
| TW201504473A (en) * | 2013-05-20 | 2015-02-01 | Nippon Steel & Sumitomo Metal Corp | Alloyed hot-dip galvanized steel sheet and manufacturing method thereof |
| CN104487606A (en) * | 2012-07-23 | 2015-04-01 | Posco公司 | Molten zinc alloy plated steel strip having excellent corrosion resistance and external surface and method for manufacturing same |
| CN105051239A (en) * | 2013-03-28 | 2015-11-11 | 杰富意钢铁株式会社 | Hot-dip Al-Zn alloy coated steel sheet and method for producing same |
-
2015
- 2015-12-20 CN CN201510953160.2A patent/CN105483590B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368139A (en) * | 2007-08-15 | 2009-02-18 | 江苏海迅实业集团股份有限公司 | Laboratory glassware detergent |
| CN104487606A (en) * | 2012-07-23 | 2015-04-01 | Posco公司 | Molten zinc alloy plated steel strip having excellent corrosion resistance and external surface and method for manufacturing same |
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| TW201504473A (en) * | 2013-05-20 | 2015-02-01 | Nippon Steel & Sumitomo Metal Corp | Alloyed hot-dip galvanized steel sheet and manufacturing method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108796416A (en) * | 2018-08-17 | 2018-11-13 | 南京力同重工机械有限公司 | A kind of galvanized method of steel member |
| CN110106460A (en) * | 2019-05-21 | 2019-08-09 | 安徽伟宏钢结构集团股份有限公司 | A kind of continuous operation steel member hot-dip galvanizing technique |
| CN111719072A (en) * | 2020-07-28 | 2020-09-29 | 惠博新型材料有限公司 | Zn-Al-Si-Mn-Bi-Ti-Ce alloy for hot dip coating and use method thereof |
| CN114807812A (en) * | 2022-04-24 | 2022-07-29 | 上海聚丰热镀锌有限公司 | Hot-dip galvanizing process for metal plated part |
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| Publication number | Publication date |
|---|---|
| CN105483590B (en) | 2018-06-15 |
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