WO2003033766A2 - Corrosion protection process - Google Patents

Corrosion protection process Download PDF

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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
Application number
PCT/EP2002/011354
Other languages
French (fr)
Other versions
WO2003033766A3 (en
Inventor
Michael John Bowyer
Stephen Kelly
John Stewart
Original Assignee
Unilever Plc
Unilever Nv
Hindustan Lever Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unilever Plc, Unilever Nv, Hindustan Lever Limited filed Critical Unilever Plc
Priority to AU2002340545A priority Critical patent/AU2002340545A1/en
Publication of WO2003033766A2 publication Critical patent/WO2003033766A2/en
Publication of WO2003033766A3 publication Critical patent/WO2003033766A3/en

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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)
  • 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)
  • Detergent Compositions (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)

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 :-
Figure imgf000006_0001
(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 .
PCT/EP2002/011354 2001-10-16 2002-10-10 Corrosion protection process WO2003033766A2 (en)

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)

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WO2003033766A2 true WO2003033766A2 (en) 2003-04-24
WO2003033766A3 WO2003033766A3 (en) 2003-10-30

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US (1) US20030113224A1 (en)
AU (1) AU2002340545A1 (en)
GB (1) GB0124846D0 (en)
WO (1) WO2003033766A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE625397A (en) *
EP0096151A1 (en) * 1982-06-03 1983-12-21 Montedison S.p.A. Method for avoiding the corrosion of strippers in urea manufacturing plants
WO1998024948A1 (en) * 1996-12-06 1998-06-11 Siemens Aktiengesellschaft Surface processing of steel or nickel alloy and processed steel or nickel alloy

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
JPS59157285A (en) * 1983-02-25 1984-09-06 Hitachi Ltd Pretreatment of martensitic stainless steel
JPH07138776A (en) * 1993-11-04 1995-05-30 Seiichi Abe Rust preventive solution composition for metal with sodium hypochlorite aqueous solution
JP2000345316A (en) * 1999-06-01 2000-12-12 Nisshin Steel Co Ltd Method for modifying surface of stainless steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE625397A (en) *
EP0096151A1 (en) * 1982-06-03 1983-12-21 Montedison S.p.A. Method for avoiding the corrosion of strippers in urea manufacturing plants
WO1998024948A1 (en) * 1996-12-06 1998-06-11 Siemens Aktiengesellschaft Surface processing of steel or nickel alloy and processed steel or nickel alloy

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 200118 Derwent Publications Ltd., London, GB; Class M14, AN 2001-172660 XP002246041 & JP 2000 345316 A (NISSHIN STEEL CO LTD), 12 December 2000 (2000-12-12) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 005 (C-260), 10 January 1985 (1985-01-10) & JP 59 157285 A (HITACHI SEISAKUSHO KK), 6 September 1984 (1984-09-06) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 08, 29 September 1995 (1995-09-29) & JP 07 138776 A (SEIICHI ABE), 30 May 1995 (1995-05-30) *

Cited By (1)

* Cited by examiner, † Cited by third party
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

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US20030113224A1 (en) 2003-06-19
GB0124846D0 (en) 2001-12-05
AU2002340545A1 (en) 2003-04-28
WO2003033766A3 (en) 2003-10-30

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