EP2352860B1 - Procédé destiné au traitement de surfaces en acier inoxydable - Google Patents

Procédé destiné au traitement de surfaces en acier inoxydable Download PDF

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Publication number
EP2352860B1
EP2352860B1 EP09737363.3A EP09737363A EP2352860B1 EP 2352860 B1 EP2352860 B1 EP 2352860B1 EP 09737363 A EP09737363 A EP 09737363A EP 2352860 B1 EP2352860 B1 EP 2352860B1
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EP
European Patent Office
Prior art keywords
salt
stainless steel
acid
weight
general structure
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP09737363.3A
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German (de)
English (en)
Other versions
EP2352860A1 (fr
Inventor
Olaf Boehme
Siegfried Piesslinger-Schweiger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Poligrat GmbH
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Poligrat GmbH
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Filing date
Publication date
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Priority to EP09737363.3A priority Critical patent/EP2352860B1/fr
Publication of EP2352860A1 publication Critical patent/EP2352860A1/fr
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Publication of EP2352860B1 publication Critical patent/EP2352860B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/088—Iron or steel solutions containing organic acids
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
    • C23G1/32—Heavy metals

Definitions

  • the present invention relates to a process for surface treatment of stainless steel instead of pickling.
  • scale and tarnish in the area of welds and heat-treated surfaces are converted into corrosion-resistant oxide layers.
  • the aim of this process is improved corrosion resistance without metal removal taking place.
  • the stainless steel surface is treated with an aqueous or pasty solution / mixture.
  • the mixture usually comprises a combination of complexing agents and an oxidizing agent.
  • Stainless steel often referred to as stainless steel, is an iron alloy that can contain other elements such as nickel, molybdenum, titanium, copper, and others in addition to iron and chromium.
  • the chromium present in the alloy reacts with oxygen from the environment at the surface to form an oxide layer on the surface of the material.
  • the resulting chromium oxide can reliably form a dense layer on the surface and thus protects the workpiece from corrosion.
  • This protective layer is called a passive layer.
  • Such a passive layer is usually about 10 molecule layers thick and contains not only chromium oxide but above all iron oxide in a concentration of 10 - 55 wt .-%. The lower the proportion of iron oxide in the passive layer, the higher its chemical resistance.
  • a thermal treatment of stainless steel in an oxidizing atmosphere at temperatures above 200 ° C causes a progressive thermal oxidation of the material to form an oxide layer consisting essentially of oxides of the metals present in the alloy and their quantitative ratio to each other substantially the ratio of metals in the alloy.
  • the thermal oxide layers therefore contain up to about 87% by weight of iron oxides. These oxide layers increase in thickness with increasing temperature and treatment time and lead to discoloration up to black or gray coverings. These are known as tinder and temper colors.
  • Such oxide layers which contain significantly more iron oxide than chromium oxide, are not resistant to corrosion, which is why the stainless steel in these areas is not sufficiently resistant to corrosion for general use.
  • the iron oxide reacts with water to form iron hydroxide and forms rust.
  • the mechanical methods have the disadvantage that the cleaning effect is not complete and sufficient and not reach hard to reach areas such as corners, gaps and cavities. Small and delicate workpieces are easily damaged.
  • Electrolytic pickling uses aqueous mixtures of mineral acids which, under the action of direct current, lead to anodic removal of the uppermost metal layer by electrochemical dissolution, wherein the overlying oxide layers are also removed. These methods can only be used with thin oxide layers that are permeable to DC and electrolyte. Furthermore, they require a lot of effort in terms of plant technology. They work with hazardous substances which also waste water containing heavy metals, which must be treated and disposed of consuming.
  • Chemical pickling chemically dissolves the oxide layers and the metal of the topmost material layer, creating a metallically clean surface. On top of this, a homogeneous passive layer can be formed which effectively protects the material from corrosion. Chemical pickling allows treatment of the entire surface of workpieces, including hard-to-reach areas.
  • a disadvantage is the fact that the dissolution of the oxides and the material extremely aggressive and hazardous chemicals are required, which pose a high risk to humans and the environment.
  • Hydrofluoric acid or fluorides of salts of hydrofluoric acid, which form hydrofluoric acid in aqueous solution, and also oxidants such as nitric acid or hydrogen peroxide.
  • Hydrofluoric acid is extremely poisonous and can lead to death even with relatively little skin contact. Nitric acid releases toxic nitrous gases during pickling, which have a strong lung damaging effect.
  • Hydrofluoric acid and nitric acid are gassing acids, which is why the air in the working environment has to be sucked off and treated separately.
  • the personnel employed for chemical pickling must wear appropriate protective clothing and, where appropriate, respiratory protection and is subject to constant medical supervision.
  • the manufacture, transportation, storage and use of chemicals used for chemical pickling are subject to strict safety regulations.
  • the wastewater produced by chemical pickling contains in a high concentration the acids contained in the pickle as well as the heavy metals contained in the alloy such as chromium, iron, nickel and molybdenum. For disposal, they must be chemically treated and the resulting solids disposed of as hazardous waste. Used pickling solutions are to be disposed of as hazardous waste.
  • the present invention is a chemical process for the treatment of the surface of stainless steel harmless to man and the environment and in terms of achievable corrosion resistance of the method according to the prior art at least equivalent, but in many cases clearly superior.
  • an aqueous solution having a specific combination of organic complexing agents in combination with an oxidizing agent has these sought-after properties.
  • the process according to the invention makes it possible selectively to remove the iron from all oxidation states of the iron, with the exception of hematite.
  • hematite is chemically sufficiently stable even under corrosive conditions so that residual hematite residues have no negative impact on the corrosion resistance of stainless steel.
  • the invention thus provides a process for surface treatment of stainless steel, in which the thermal oxide layers are brought into contact with a composition which causes a selective dissolution of iron ions from the oxide layer.
  • the surfaces which are treated according to the invention are stainless steel surfaces which have so-called thermal oxide layers.
  • Thermal oxide layers are just not such oxide-containing layers that usually serve to passivate the stainless steel surface. Rather, the thermal oxide layers are unwanted and disruptive oxide layers which, on the one hand, lead to discoloration and, on the other hand, are themselves susceptible to corrosion or increase the susceptibility to corrosion of a stainless steel surface. Therefore, it is always necessary according to the state of the art that thermal oxide layers are removed in the context of corrosion resistance-improving measures.
  • the present invention differs not only conceptually but also fundamentally from the prior art with regard to the aqueous solution actually used.
  • Solutions which can be used according to the invention proposes for another method DE 10 2007 010 538 A1 the present applicant already before.
  • this process involves protecting a stainless steel surface against undesired colorations by pretreating with an optimized aqueous passivating solution, which may be caused by the fact that the stainless steel surface is exposed to temperatures at which thermal oxide layers first form. So this process just wants exactly the thermal oxide layers prevent, which are treated according to the present inventive method.
  • Thermal oxide layers in the context of the invention are scale and tarnish, as they usually occur in thermal treatment or in the welding of stainless steels. These surface layers are regularly recognized by the fact that they lead to a discoloration of the surface. The surface may then have a straw-yellow coloration, but may, depending on the duration and intensity of the thermal treatment of the surface, even in brown and blue shades.
  • tempering in the case of high-alloyed steels, the following tempering colors and layer thicknesses are regularly observed at a tempering (elevated temperature) of about 350 ° C. to> 1200 ° C.
  • the chemical composition of the solution or mixture used according to the invention is now chosen such that, on the one hand, there is no measurable erosion of the surface, but on the other hand, a dissolution of the iron ions from the oxide layer takes place on the surface.
  • the method according to the invention thus acts in a similar way to a pickling method, in which, unlike pickling according to the prior art, the thermal oxide layers are not detached. Therefore, it is also possible according to the invention to use such mixtures which do not entail the disadvantages of the pickling baths used in the prior art.
  • the dissolution of the iron ions from the surface preferably takes place selectively.
  • selective herein is meant that the complexing agent has a stronger affinity (i.e., greater complexing) to the iron than to the other components in the thermal oxide layers (eg, chromium or nickel).
  • the solutions / mixtures according to the invention comprise a combination of a complexing agent for iron and an oxidizing agent.
  • the complexing agent is usually such a compound that can complex iron ions in aqueous solution.
  • hydroxycarboxylic acids, phosphonic acids and organic nitrosulfonic acids can be used as complexing agents.
  • the preferred complexing agents are multidentate complexing agents. These multidentate complexing agents can form chelate complexes with iron ions. This makes it possible to increase the ratio of chromium oxide to iron oxide in the thermal oxide layers.
  • suitable complexing agents furthermore include hydroxycarboxylic acids which have 1, 2 or 3 hydroxyl groups and 1, 2 or 3 carboxyl groups or their salts.
  • a particularly suitable hydroxycarboxylic acid is citric acid.
  • Another suitable complexing agent is the phosphonic acid having the general formula R'-PO (OH) 2 , where R 'is a monovalent alkyl, hydroxyalkyl or aminoalkyl radical.
  • Diphosphonic acid of the general formula R "[- PO (OH) 2 ] 2 can also be used according to the invention, where R" is a divalent alkyl, hydroxyalkyl or aminoalkyl radical.
  • phosphonic acids and / or diphosphonic acids it is also possible to use one or more salts of these phosphonic acids or diphosphonic acids.
  • a particularly preferred example of such an acid is 1-hydroxyethane-1,1-diphosphonic acid (HEDP) or its salt.
  • HEDP 1-hydroxyethane-1,1-diphosphonic acid
  • suitable complexing agents are the organic nitrosulfonic acids, for example nitroalkylsulfonic acids, nitroarylsulfonic acids or salts thereof.
  • a particularly preferred nitroarylsulfonic acid is the meta-nitrobenzenesulfonic acid.
  • the substituted or unsubstituted alkyl or aryl radicals used should be selected such that the acid or salt has sufficient solubility in the aqueous solution / mixture. Therefore, a hydrocarbon chain preferably has not more than twelve carbon atoms.
  • compositions of the invention may additionally contain oxidizing agents.
  • Suitable oxidizing agents are, for example, nitrates, peroxo compounds, iodates and cerium (IV) compounds in the form of the respective acids or water-soluble salts.
  • peroxo compounds are peroxides, persulfates, perborates or else percarboxylates, such as peracetate.
  • the oxidizing agents may be used alone or in the form of mixtures.
  • an iron alloy containing a considerable proportion for example, about 13 wt .-% and more chromium.
  • the solutions / mixtures according to the invention may additionally comprise one or more wetting agents which reduce the surface tension of the aqueous compositions.
  • suitable wetting agents are, for example, the nitroalkyl- or nitroarylsulfonic acids already described in connection with complexing agents, or also alkylglycols of the general formula H- (O-CHR-CH 2 ) n -OH, where R is hydrogen or an alkyl radical having 1, 2 or 3 carbon atoms, and n is preferably an integer between 1 and 5, for example 2 or 3.
  • compositions may be added in these compositions in a concentration between 0.02 and 2.0% by weight, preferably between 0.05 and 1.0% by weight.
  • these compositions may optionally contain one or more thickening agents. Suitable thickeners are, for example, methyl cellulose and kieselguhr. Such a thickener serves to increase the viscosity of the mixture.
  • the inventive method is carried out regularly at a temperature between room temperature and 95 ° C. But there are also other temperatures conceivable, while it must always be ensured that there is no significant removal of the treated thermal oxide layers.
  • the surface treatment according to the invention is usually carried out over a period of time which can be between 0.5 and 7 hours.
  • the stainless steel surface is periodically rinsed with water, usually with deionized water rinse.
  • the pickling process can be carried out as a liquid by spraying, trickling, wiping or - slightly thickened by a suitable thickener (methylcellulose) - as spreadable paste in the dipping bath or by applying to the surfaces to be cleaned.
  • a suitable thickener methylcellulose
  • the application temperature in the immersion bath is preferably 50 ° C to 95 ° C, preferably 50 ° C to 70 ° C.
  • the treatment time is 3 to 5 hours depending on the degree of scaling, the alloy to be treated and the temperature used. At lower temperatures, the exposure time may be longer. Temperatures below 50 ° C are only used in applications outside the bath.
  • the temperature of the immersion baths should be at least permanently 50 ° C, in order to avoid biological degradation of the bath liquid.
  • the present invention therefore also relates to the use of a complexing agent for iron-containing composition which substantially is free of hydrofluoric acid and / or of fluoride ions and other halide ions and mineral acids, for surface treatment of a workpiece made of stainless steel, said surface having thermal oxide layers.
  • the other constituents of the composition and the procedure for the surface treatment the prerequisites and features previously established and specified for the method apply.
  • substantially free of hydrofluoric acid and / or fluoride ions means that the composition contains, for example, not hydrofluoric acid in a proportion as it is present in conventional mordants. Preferably, however, the composition is completely free of hydrofluoric acid. Usually, the composition also contains virtually no mineral acids.
  • Sample B was immersed in a pickling solution consisting of 5 wt .-% hydrofluoric acid and 15 wt .-% nitric acid, balance water for 3 hours at room temperature, then rinsed with deionized water and for a period of 30 minutes at room temperature in a passivation solution consisting of 20 wt .-% nitric acid, balance water, immersed. Finally, the sample was rinsed with deionized water and dried.

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  • 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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (5)

  1. Procédé de traitement d'une surface en acier inoxydable comprenant des couches d'oxydes thermiques tels que calamine ou couleurs de revenu qui apparaissent lors du traitement thermique ou du soudage d'aciers inoxydables, en utilisant une composition liquide, caractérisé en ce que
    les couches d'oxydes thermiques sont mises en contact avec une composition qui provoque une libération d'ions fer des couches d'oxydes thermiques,
    on utilise une composition contenant un agent complexant susceptible de former des complexes avec les ions fer, et contenant un agent oxydant,
    et en ce que le procédé est mis en oeuvre sans enlèvement de matière de la surface.
  2. Procédé selon la revendication 1, caractérisé en ce que l'agent complexant est choisi parmi :
    - au moins un acide hydroxy-carboxylique avec 1 à 3 groupes hydroxyle et 1 à 3 groupes carboxyle ou son/ses sel(s),
    - au moins un acide phosphonique de structure générale R'-PO(OH)2 ou son/ses sel(s), R' étant un reste alkyle, hydroxyalkyle ou aminoalkyle monovalent, et/ou de structure générale R"[-PO(OH)2]2 ou son/ses sel(s), R" étant un reste alkyle, hydroxyalkyle ou aminoalkyle bivalent, et
    - au moins un acide sulfonique de nitroaryle ou de nitroalkyle ou son/ses sel(s).
  3. Procédé selon l'une des revendications 1 ou 2, selon lequel l'agent oxydant comprend au moins un composé qui est choisi parmi le groupe constitué du nitrate, peroxyde, persulfate, perborate, des percarboxylates, de l'iodate et des composés de cérium(IV) sous la forme des acides et/ou sels respectifs.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la solution aqueuse comprend :
    - de 0,5 à 10 % en poids d'au moins un acide hydroxy-carboxylique avec 1 à 3 groupes hydroxyles et 1 à 3 groupes carboxyles ou son/ses sel(s),
    - de 0,2 à 5,0 % en poids d'au moins un acide phosphonique de structure générale R'-PO(OH)2 ou son/ses sel(s), R' étant un reste alkyle, hydroxyalkyle ou aminoalkyle monovalent, et/ou de structure générale R"[-PO(OH)2]2 ou son/ses sel(s), R" étant un reste alkyle, hydroxyalkyle ou aminoalkyle divalent,
    - de 0,1 à 5,0 % en poids d'au moins un acide sulfonique de nitroaryle ou de nitroalkyle ou son/ses sel(s),
    - de 0,05 à 1,0 % en poids d'au moins un alkylglycol de structure générale H-(O-CHR-CH2)n-OH, R étant de l'hydrogène ou un reste alkyle avec 1 à 3 atomes de carbone et n ayant une valeur de 1 à 5, et
    - de 0,2 à 20 % en poids d'un agent oxydant,
    le reste de la solution étant de l'eau à laquelle peuvent en outre être additionnés au choix un ou plusieurs épaississants.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la mise en contact a lieu dans une plage de température comprise entre la température ambiante et 95 °C.
EP09737363.3A 2008-10-29 2009-10-15 Procédé destiné au traitement de surfaces en acier inoxydable Not-in-force EP2352860B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09737363.3A EP2352860B1 (fr) 2008-10-29 2009-10-15 Procédé destiné au traitement de surfaces en acier inoxydable

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08018874A EP2182095A1 (fr) 2008-10-29 2008-10-29 Procédé destiné au traitement de surfaces en acier inoxydable
PCT/EP2009/007402 WO2010049065A1 (fr) 2008-10-29 2009-10-15 Procédé de traitement de surface pour acier inoxydable
EP09737363.3A EP2352860B1 (fr) 2008-10-29 2009-10-15 Procédé destiné au traitement de surfaces en acier inoxydable

Publications (2)

Publication Number Publication Date
EP2352860A1 EP2352860A1 (fr) 2011-08-10
EP2352860B1 true EP2352860B1 (fr) 2015-12-16

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP08018874A Withdrawn EP2182095A1 (fr) 2008-10-29 2008-10-29 Procédé destiné au traitement de surfaces en acier inoxydable
EP09737363.3A Not-in-force EP2352860B1 (fr) 2008-10-29 2009-10-15 Procédé destiné au traitement de surfaces en acier inoxydable

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP08018874A Withdrawn EP2182095A1 (fr) 2008-10-29 2008-10-29 Procédé destiné au traitement de surfaces en acier inoxydable

Country Status (8)

Country Link
US (1) US9115433B2 (fr)
EP (2) EP2182095A1 (fr)
JP (1) JP5586614B2 (fr)
AU (1) AU2009310094A1 (fr)
CA (1) CA2741704A1 (fr)
ES (1) ES2559387T3 (fr)
HU (1) HUE026531T2 (fr)
WO (1) WO2010049065A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK3084035T3 (en) * 2013-12-18 2018-10-15 Sepies Gmbh Process for producing colored stainless steel surfaces
JP6526406B2 (ja) * 2014-12-10 2019-06-05 株式会社Ihi ステンレス鋼部品の不動態化処理方法及びステンレス鋼部品用の不動態化処理液
EP3249076B1 (fr) * 2016-05-24 2018-08-22 Technochim SA Produits pour le traitement préventif d'acier inoxydable et procédés associés
US10443135B1 (en) * 2018-05-11 2019-10-15 Macdermid Enthone Inc. Near neutral pH pickle on multi-metals
JP6592624B2 (ja) * 2019-01-15 2019-10-16 株式会社Ihi ステンレス鋼部品の不動態化処理方法及びステンレス鋼部品用の不動態化処理液
CN110129806A (zh) * 2019-05-17 2019-08-16 浙江猫头鹰网络科技有限公司 抛光前处理酸洗液
IL318589B1 (en) * 2025-01-23 2026-02-01 Novet Group Ltd Unique color resistant to metal corrosion

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Publication number Priority date Publication date Assignee Title
JPS59190374A (ja) * 1983-04-14 1984-10-29 Ishikawajima Harima Heavy Ind Co Ltd 酸化スケ−ルの溶解除去方法
DE9214890U1 (de) * 1992-11-02 1993-01-07 Poligrat GmbH, 8000 München Mittel zum Beizen und/oder Reinigen von Metalloberflächen
JP2941948B2 (ja) * 1994-09-26 1999-08-30 カルゴン ベスタル， インコーポレイテッド ステンレス鋼酸処理
RU2119553C1 (ru) * 1997-04-18 1998-09-27 Закрытое акционерное общество "Центр новых технологий "Оптрон" Способ удаления оксидов и гидроксидов железа с поверхности изделий из стали
CA2253679A1 (fr) * 1998-01-26 1999-07-26 Elf Atochem S.A. Passivation des aciers inoxydables en milieu acide organosulfonique
AUPP762398A0 (en) * 1998-12-09 1999-01-14 Cairnscorp Technology Pty. Limited Cleaning solutions containing citric acid and uses thereof
US20030221702A1 (en) * 2002-05-28 2003-12-04 Peebles Henry C. Process for cleaning and repassivating semiconductor equipment parts
US20060079424A1 (en) 2004-09-23 2006-04-13 Perry Stephen C Buffered acid cleaner and method of production
DE102007010538A1 (de) * 2007-03-05 2008-09-11 Poligrat Gmbh Verfahren zum thermochemischen Passivieren von Edelstahl

Also Published As

Publication number Publication date
CA2741704A1 (fr) 2010-05-06
ES2559387T3 (es) 2016-02-11
EP2352860A1 (fr) 2011-08-10
HUE026531T2 (en) 2016-06-28
US9115433B2 (en) 2015-08-25
EP2182095A1 (fr) 2010-05-05
JP5586614B2 (ja) 2014-09-10
JP2012506951A (ja) 2012-03-22
US20110309296A1 (en) 2011-12-22
AU2009310094A1 (en) 2010-05-06
WO2010049065A1 (fr) 2010-05-06

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