WO2003033766A2 - Corrosion protection process - Google Patents
Corrosion protection process Download PDFInfo
- Publication number
- WO2003033766A2 WO2003033766A2 PCT/EP2002/011354 EP0211354W WO03033766A2 WO 2003033766 A2 WO2003033766 A2 WO 2003033766A2 EP 0211354 W EP0211354 W EP 0211354W WO 03033766 A2 WO03033766 A2 WO 03033766A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition
- hydrogen peroxide
- hypohalite
- weight
- process according
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005260 corrosion Methods 0.000 title claims abstract description 10
- 230000007797 corrosion Effects 0.000 title claims abstract description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 31
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims description 4
- 239000002736 nonionic surfactant Substances 0.000 claims description 3
- -1 alkali metal hypochlorite Chemical class 0.000 claims description 2
- 239000003945 anionic surfactant Substances 0.000 claims description 2
- 239000002609 medium Substances 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- JGJLWPGRMCADHB-UHFFFAOYSA-N hypobromite Chemical group Br[O-] JGJLWPGRMCADHB-UHFFFAOYSA-N 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- JXLHNMVSKXFWAO-UHFFFAOYSA-N azane;7-fluoro-2,1,3-benzoxadiazole-4-sulfonic acid Chemical compound N.OS(=O)(=O)C1=CC=C(F)C2=NON=C12 JXLHNMVSKXFWAO-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- RWGFKTVRMDUZSP-UHFFFAOYSA-N cumene Chemical compound CC(C)C1=CC=CC=C1 RWGFKTVRMDUZSP-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229940117927 ethylene oxide Drugs 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001706 oxygenating effect Effects 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000003442 weekly 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
- 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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron 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
- 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
- C23C22/68—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 solutions with pH between 6 and 8
Definitions
- the present invention relates to a process for improving the corrosion resistance of stainless steel .
- EP-A-096 151 describes a method for passivating the surface of strippers of urea manufacturing plants, using a first passivating agent consisting of an oxygen-containing gas and a second passivating agent in liquid form, selected from hydrogen peroxide, alkali metal persulphates, alkali metal perborates, peracetic acid and organic peroxides.
- a first passivating agent consisting of an oxygen-containing gas and a second passivating agent in liquid form, selected from hydrogen peroxide, alkali metal persulphates, alkali metal perborates, peracetic acid and organic peroxides.
- a method of passivating a stainless steel article having a surface oxide layer to be passivated, using a dry gaseous fluid chemically non-reactive with the stainless steel, flushing the surface and baking the article, is described in US-A-5 188 714 the gas is typically nitrogen or argon.
- Manganese dioxide e.g. precipitated from a potassium permaganate solution, to coat the walls of a polymerization reactor, is known from EP-A- 327 202.
- FR-A-625 397 discloses a process of passivating a chrome- nickel steel reactor for urea synthesis, using a small quantity of an oxygenating substance such as a peroxide.
- the present invention now provides a process for the protection of stainless surface from corrosion by a hypohalite-containing composition, the process comprising: -
- the present invention protects stainless steel surfaces of pipes, vessels and the like for the pumping, transporting, storage or preparation of hypohalite-containing compositions or of any other stainless steel surface to come into contact with the hypohalite composition.
- the hypohalite is hypobromite or hypochlorite, especially hypochlorite.
- the hydrogen peroxide may be provided as a simple aqueous solution or in a (preferably aqueous) composition, optionally containing one or more other ingredients, such as surfactants.
- a surfactant system in an aqueous medium is one suitable composition.
- the hydrogen peroxide composition preferably contains from 0.1% to 10%, more preferably from 1% to 5% by weight of hydrogen peroxide .
- a typical aqueous medium containing a surfactant system comprises from 0.01% to 1%, preferably from 0.1% to 1% by weight of anionic surfactant and from 0.1% to 10%, preferably from 1% to 5% by weight of nonionic surfactant.
- the hydrogen peroxide containing medium also contains a hydrogen peroxide stabiliser such as a heavy metal sequestrant, e.g. of the phosphonate type.
- a hydrogen peroxide stabiliser such as a heavy metal sequestrant, e.g. of the phosphonate type.
- Typical hypohalite-based products against which the stainless steel is to be protected include aqueous hypochlorite bleaches, especially aqueous thickened alkali metal hypochlorite bleaches.
- hypohalite composition comprises an alkali metal silicate, preferably sodium silicate .
- the concentration of the alkali metal silicate in the hypohalite composition in which it is applied is preferably from 0.01% to 5%, more preferably from 0.1% to 1% by weight of that composition.
- the hypohalite composition may contain from 1% to 25%, e.g. from 10% to 20% by weight of an amine oxide surfactant .
- the surface may be treated with the hydrogen peroxide containing medium by filling of a container, the inside surface of which is to be passivated, or by spraying the surface to be subsequently exposed to the hypochlorite, or by any other means. Preferably it is removed, e.g. by drainage, before the surface is contacted with the hypohalite composition.
- a 40 litre stainless steel vessel was filled with a hydrogen peroxide containing pre-treatment composition and left for an hour.
- the peroxide-containing composition was then drained and the vessel was filled with a thickened bleach composition.
- compositions were as follows :-
- the vessel was inspected daily for evidence of corrosion. On a weekly basis, the bleach was drained and the available chlorine measured, to check that no decomposition (and associated loss of corrosivity) had occurred. The vessel was then re-filled with product. No further peroxide treatment was undertaken after the initial pre-passivation.
Landscapes
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Detergent Compositions (AREA)
Abstract
A process for the protection of stainless surface from corrosion by a hypohalite-containing composition, the process comprising: (a) contacting the surface with a composition comprising hydrogen peroxide; and (b) contacting the surface with the hypohalite-containing composition.
Description
CORROSION PROTECTION PROCESS
Field of the Invention
The present invention relates to a process for improving the corrosion resistance of stainless steel .
Background of the Invention
In the production or storage of hypochlorite-based products, stainless steel vessels exposed to those are rapidly subject to corrosion.
EP-A-096 151 describes a method for passivating the surface of strippers of urea manufacturing plants, using a first passivating agent consisting of an oxygen-containing gas and a second passivating agent in liquid form, selected from hydrogen peroxide, alkali metal persulphates, alkali metal perborates, peracetic acid and organic peroxides.
A method for passivating stainless steel using sulphuric acid, Fe3+, hydrogen fluoride, hydrogen peroxide, non-ionic surfactants and acid attack inhibitors is disclosed in US-A- 5 354 383.
A method of passivating a stainless steel article having a surface oxide layer to be passivated, using a dry gaseous fluid chemically non-reactive with the stainless steel,
flushing the surface and baking the article, is described in US-A-5 188 714 the gas is typically nitrogen or argon.
Manganese dioxide, e.g. precipitated from a potassium permaganate solution, to coat the walls of a polymerization reactor, is known from EP-A- 327 202.
FR-A-625 397 discloses a process of passivating a chrome- nickel steel reactor for urea synthesis, using a small quantity of an oxygenating substance such as a peroxide.
We have now found that a hydrogen peroxide solution is a simple and effective medium for passivating stainless steel subsequently to be exposed to a hypohalite-containing medium.
Definition of the Invention
Thus, the present invention now provides a process for the protection of stainless surface from corrosion by a hypohalite-containing composition, the process comprising: -
(a) contacting the surface with a composition comprising hydrogen peroxide; and
(b) contacting the surface with the hypohalite-containing composition.
Detailed Description of the Invention
The present invention protects stainless steel surfaces of pipes, vessels and the like for the pumping, transporting, storage or preparation of hypohalite-containing compositions or of any other stainless steel surface to come into contact with the hypohalite composition.
Preferably, the hypohalite is hypobromite or hypochlorite, especially hypochlorite.
The hydrogen peroxide may be provided as a simple aqueous solution or in a (preferably aqueous) composition, optionally containing one or more other ingredients, such as surfactants. A surfactant system in an aqueous medium is one suitable composition.
The hydrogen peroxide composition preferably contains from 0.1% to 10%, more preferably from 1% to 5% by weight of hydrogen peroxide .
A typical aqueous medium containing a surfactant system, comprises from 0.01% to 1%, preferably from 0.1% to 1% by weight of anionic surfactant and from 0.1% to 10%, preferably from 1% to 5% by weight of nonionic surfactant.
Preferably, the hydrogen peroxide containing medium also contains a hydrogen peroxide stabiliser such as a heavy metal sequestrant, e.g. of the phosphonate type.
Typical hypohalite-based products against which the stainless steel is to be protected include aqueous hypochlorite bleaches, especially aqueous thickened alkali metal hypochlorite bleaches.
It has also been found that passivation of this stainless steel surface is synergised if the hypohalite composition comprises an alkali metal silicate, preferably sodium silicate .
The concentration of the alkali metal silicate in the hypohalite composition in which it is applied is preferably from 0.01% to 5%, more preferably from 0.1% to 1% by weight of that composition. Optionally, the hypohalite composition may contain from 1% to 25%, e.g. from 10% to 20% by weight of an amine oxide surfactant .
The surface may be treated with the hydrogen peroxide containing medium by filling of a container, the inside surface of which is to be passivated, or by spraying the surface to be subsequently exposed to the hypochlorite, or by any other means. Preferably it is removed, e.g. by drainage, before the surface is contacted with the hypohalite composition.
Detailed Description of Preferred Embodiments
A 40 litre stainless steel vessel was filled with a hydrogen peroxide containing pre-treatment composition and left for an hour. The peroxide-containing composition was then drained and the vessel was filled with a thickened bleach composition.
The compositions were as follows :-
(1) Ci2 - Ci4 Amine Oxide
(2) Cχ8 (average) amine ethoxylate with an average of 2 ethyleneoxide groups
(3) Sodium Cumen Sulphonate
The vessel was inspected daily for evidence of corrosion. On a weekly basis, the bleach was drained and the available chlorine measured, to check that no decomposition (and associated loss of corrosivity) had occurred. The vessel
was then re-filled with product. No further peroxide treatment was undertaken after the initial pre-passivation.
No corrosion was observed after a period of 4 weeks, except on the rim of the vessel, under the outside of the gasket. Here, crevice corrosion occurred, but this region was not wetted during the peroxide pre-passivation.
Claims
1. A process for the protection of stainless surface from corrosion by a hypohalite-containing composition, the process comprising :-
(a) contacting the surface with a composition comprising hydrogen peroxide; and
(b) contacting the surface with the hypohalite- containing composition.
2. A process according to claim 1, wherein during step
(a) , the surface is sprayed with said hydrogen peroxide composition.
3. A process according to claim 1, wherein the surface is an internal surface of a vessel filled with the hydrogen peroxide composition.
4. A composition according to any preceding claim, wherein the hypohalite-containing composition further comprises an alkali metal silicate.
5. A process according to claim 4, wherein the alkali metal silicate constitutes from 0.01% to 5%, preferably from 0.1% to 1% by weight of the hypohalite-containing composition.
6. A process according to any preceding claim, wherein the hydrogen peroxide composition comprises from 0.1% to 10%, preferably from 1% to 5% by weight of hydrogen peroxide .
A process according to claim 6, wherein the surfactant system comprises from 0.1% to 5%, preferably from 1% to 5% of the composition by weight of hydrogen peroxide, from 0.01% to 1%, preferably from 0.1% to 1% by weight of anionic surfactant and from 0.1% to 10%, preferably from 1% to 5% by weight of nonionic surfactant.
Use of a hydrogen peroxide solution to passivate a stainless steel surface, prior to exposure of the surface to a composition containing an alkali metal hypochlorite .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2002340545A AU2002340545A1 (en) | 2001-10-16 | 2002-10-10 | Corrosion protection process |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0124846.7A GB0124846D0 (en) | 2001-10-16 | 2001-10-16 | Corrosion protection process |
| GB0124846.7 | 2001-10-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2003033766A2 true WO2003033766A2 (en) | 2003-04-24 |
| WO2003033766A3 WO2003033766A3 (en) | 2003-10-30 |
Family
ID=9923962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2002/011354 WO2003033766A2 (en) | 2001-10-16 | 2002-10-10 | Corrosion protection process |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20030113224A1 (en) |
| AU (1) | AU2002340545A1 (en) |
| GB (1) | GB0124846D0 (en) |
| WO (1) | WO2003033766A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014117436A1 (en) * | 2013-01-30 | 2014-08-07 | 中国科学院金属研究所 | Process for improving pitting corrosion resistance of austenitic stainless steels by chemical processing |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6040094B2 (en) * | 2013-04-25 | 2016-12-07 | 株式会社Ihi | Passivation method for stainless steel parts |
| CN113906161A (en) * | 2019-06-11 | 2022-01-07 | 三菱瓦斯化学株式会社 | Aqueous composition, method for roughening surface of stainless steel using same, roughened stainless steel, and method for producing same |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE625397A (en) * | ||||
| NL164328C (en) * | 1970-04-02 | 1980-12-15 | Stamicarbon | PROCESS FOR INCREASING RESISTANCE TO CORROSION OF AUSTENITIC CHROME-NICKEL SAMPLES, AND METHOD FOR PREPARING UREA IN APPARATUS THEREFORE INCREASED IN RESISTANCE TO CORROSION. |
| DE3364579D1 (en) * | 1982-06-03 | 1986-08-28 | Montedison Spa | Method for avoiding the corrosion of strippers in urea manufacturing plants |
| JPS59157285A (en) * | 1983-02-25 | 1984-09-06 | Hitachi Ltd | Pretreatment method for martensitic stainless steel |
| JPH07138776A (en) * | 1993-11-04 | 1995-05-30 | Seiichi Abe | Rust preventive solution composition for metal with sodium hypochlorite aqueous solution |
| CH691479A5 (en) * | 1996-12-06 | 2001-07-31 | Siemens Ag | Surface treatment of steel. |
| JP2000345316A (en) * | 1999-06-01 | 2000-12-12 | Nisshin Steel Co Ltd | Method for modifying surface of stainless steel |
-
2001
- 2001-10-16 GB GBGB0124846.7A patent/GB0124846D0/en not_active Ceased
-
2002
- 2002-10-10 WO PCT/EP2002/011354 patent/WO2003033766A2/en not_active Application Discontinuation
- 2002-10-10 AU AU2002340545A patent/AU2002340545A1/en not_active Abandoned
- 2002-10-15 US US10/270,750 patent/US20030113224A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014117436A1 (en) * | 2013-01-30 | 2014-08-07 | 中国科学院金属研究所 | Process for improving pitting corrosion resistance of austenitic stainless steels by chemical processing |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0124846D0 (en) | 2001-12-05 |
| WO2003033766A3 (en) | 2003-10-30 |
| US20030113224A1 (en) | 2003-06-19 |
| AU2002340545A1 (en) | 2003-04-28 |
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