WO1988006639A1 - Procede de formation d'un revetement resistant a la corrosion - Google Patents

Procede de formation d'un revetement resistant a la corrosion Download PDF

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Publication number
WO1988006639A1
WO1988006639A1 PCT/AU1988/000060 AU8800060W WO8806639A1 WO 1988006639 A1 WO1988006639 A1 WO 1988006639A1 AU 8800060 W AU8800060 W AU 8800060W WO 8806639 A1 WO8806639 A1 WO 8806639A1
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WO
WIPO (PCT)
Prior art keywords
metal surface
cerium
acidic solution
method defined
metal
Prior art date
Application number
PCT/AU1988/000060
Other languages
English (en)
Inventor
Lance Wilson
Bruce Roy William Hinton
Original Assignee
Commonwealth Of Australia
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 Commonwealth Of Australia filed Critical Commonwealth Of Australia
Publication of WO1988006639A1 publication Critical patent/WO1988006639A1/fr

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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
    • 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
    • C23C22/53—Treatment of zinc or alloys based thereon

Definitions

  • the present invention relates to a method of forming coatings on metal surfaces " to inhibit corrosio .
  • Corrosion is an electrochemical process . generally consisting of two or more partial reactions.
  • cathodic sites which may be copper or iron rich micro-constituents, . cathodic reactions such as the reduction of oxygen (O2 + 2H 2 0 + 4e ⁇ 0H ) and the evolution of hydrogen 2H + 2e ⁇ H 2 occur- Inhibition of corrosion can be achieved if any of these reactions can be stopped or the rates at which they proceed reduced.
  • chromates have been the accepted inhibitors of corrosion of aluminium alloys in aqueous environments .
  • chromates are employed in paint films and sealants . Chromates are classified as anodic inhibitors because they prevent metal dissolution by forming a stable passive film on the metal surface.
  • Zinc salts have also been used to inhibit corrosion. Inhibition by zinc cations results from the deposition of insoluble zinc hydroxide at cathodic sites promoting reduced rates of cathodic reaction. Thus, zinc is classified as a cathodic inhibitor. In practice, it is frequently used as zinc phosphate.
  • the corrosion resistance was attributed to the formation of a complex hydrated cerium oxide film on the aluminium alloy.
  • the research suggested that the cerium oxide film, if applied as a coating to 7075 aluminium alloy, could offer protection against corrosion in chloride containing environments .
  • a method of forming a coating containing cerium on the surface of a metal comprising:
  • the method comprises the use of hydrogen peroxide as the oxidising agent.
  • the preferred method comprises:
  • the metal is any one of aluminium, steel, zinc, cadmium and magnesium.
  • cerium salt is cerium chloride.
  • the pH of the acidic solution is less than 3.0 prior to contact with the metal surface.
  • the pH of the acid solution is above 3.0 in the region -of the metal surface after contact with the metal surface.
  • the quality of the coating is dependent on a number of factors such as the concentration of cerium cations in the acidic solution and the contact time of the acidic solution with the metal surface. It is preferred that the concentration of the cerium cations is between 5000 and 15000 parts per million (ppm) and the contact time is less than 60 minutes. It is particularly preferred that the concentration of the cerium cations is 10000 ppm and the contact time is 7 minutes.
  • test specimens were prepared by forming coatings on samples of 7075 aluminium alloy plate (Al, 5.6% Zn, 2.5% Mg, 1.6% Cu, 0.3% Cr) .
  • Each test specimen was formed by mixing together cerous chloride and hydrogen peroxide to form an aqueous acidic solution and then immersing samples of 7075 aluminium alloy plate in the acidic solution to form a coating thereon.
  • the effect of the following variables on corrosion rate of the test specimens was investigated:
  • the graph in Figure 1 illustrates the effect of the concentration of cerous chloride in the acidic solution on the corrosion rate of a series of test ' specimens prepared under the following conditions: ( a ) pH : 2 . 7 ;
  • the graph indicates that only a small concentration of cerous chloride in the acidic solution was required to form corrosion-resistant coatings on the samples of 7075 aluminium alloy plate. Specifically, a
  • the graph in figure 1 also confirms the effectiveness of the use of cerium to form corrosion-resistant coatings. Specifically, the graph indicates that corrosion rates of only 4.2 ⁇ g/m 2 /sec were recorded with test specimens prepared in acidic solutions containing between 5000 and 20,000 ppm cerous chloride (cf corrosion rate of 7 ⁇ g/m /sec for untreated samples of 7075 aluminium alloy plate).
  • the graph in Figure 2 illustrates the effect of the concentration of hydrogen peroxide in the acidic solution on the corrosion rate of a series of test specimens prepared under the following conditions:
  • the graph indicates that the concentration of hydrogen peroxide in the acidic solution had a significant effect on the corrosion-resistant characteristics of the coatings formed on the samples of 7075 aluminium alloy plate. This is reflected by the fact that a relatively high corrosion rate of 5.5 ⁇ g/m /s&c was recorded with a test specimen prepared in an acidic solution containing 1% hydrogen peroxide,
  • the graph in figure 3 illustrates the effect of the pH of the acidic solution on the corrosion rate of a series of test specimens prepared under the following conditions . :
  • the graph indicates that the pH of the acidic solution had a significant effect on the corrosion-resistant characteristics of coatings formed on the samples of 7075 aluminium alloy plate.
  • the profile of the graph in Figure 3 indicates an optimum range of values of pH centred on 2.5. It is thought that the progressive increase in corrosion rate as the pH decreased from 2.5 was due to the pH being increasingly too low for the subsequent increase in- pH following contact with the samples of 7075 aluminium alloy plate to reach a threshold pH at which cerium precipitates. Moreover, whilst not clearly shown in the graph, it is expected that the corrosion rate would progressively increase as the pH increased from 2.5, and it is thought this trend would be due to cerium precipitating in the bulk of the acidic solution rate than as a coating on the samples of 7075 aluminium alloy plate.
  • the graphs in Figures 4 and 5 respectively illustrate the effect of immersion time and immersion temperature on the corrosion rate of a series of test specimens prepared under the set conditions for the pH of the acidic solution and concentrations of H 2 0 2 and CeCl3 (7H2O) described above.
  • the graph in Figure 4 indicates that an. immersion time of only 3 minutes was necessary to form a corrosion-resistant coating on a sample of 7075 aluminium alloy plate, and the graph in Figure 5 indicates that the temperature of the acidic solution did not affect significantly the corrosion-resistant characteristics of the coatings formed on the samples of 7075 aluminium alloy plate.
  • a series of experiments was carried out to investigate the adhesion of an epoxy primer/polyurethane paint film to coatings formed from cerium.
  • the experiments comprised forming a paint film on the test specimens and then gluing a block having an upstanding shaft onto the paint film. The block was then rotated about the axis of the shaft while the plate was held stationary. The torque at failure was determined to provide a measure of the adhesion strength of the paint film to the coatings .
  • test specimens similar to those described in the foregoing were prepared.
  • the only change in the procedure for preparing the test specimens was the addition of brighteners to the acidic solution.
  • the brighteners included pearl glue, dextrose, glucose and starch. It was found that there was a further lowering of the corrosion rates of the test specimens.
  • test specimens were prepared by forming coatings on zinc plate rather than 7075 aluminium plate. It was found that the rate of corrosion of the test specimens was up to 8 times less than the rate of corrosion of untreated zinc plate.
  • the acidic solution thus formed has a pH approximately 2, and when the metal contacts the solution the surface layers of the metal are attacked and hydrogen is evolved. The evolution of. hydrogen results in an increase in the pH at the metal surface.
  • the above preferred method of forming a cerium cation coating has a number of advantages over the known methods.
  • One of the advantages is that the method is not dependent on applying a cathodic potential to form a coating in a reasonable time.
  • Another advantage is that the method results in coatings that are uniform, have good corrosion properties and paint film adhesion properties.
  • cerous chloride as the source of cerium cations
  • cerous sulphate as the source of cerium cations
  • mischmetall chloride as the source of cerium sulphate
  • cerous perehlorate cerium acetyl acetonate
  • cerous nitrate cerous nitrate

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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)
  • Chemical Treatment Of Metals (AREA)
  • Catalysts (AREA)

Abstract

Un procédé, qui sert à former un revêtement à base de cérium sur la surface d'un métal, consiste à former une solution acide ayant un pH inférieur à celui auquel se produit la précipitation du cérium, à oxyder les cations de cérium en les faisant passer d'un état de valence +3 à un état de valence +4 et à immerger le métal dans la solution acide, afin d'obtenir une augmentation du pH suffisante pour déclencher la précipitation du cérium sur le métal.
PCT/AU1988/000060 1987-03-03 1988-03-03 Procede de formation d'un revetement resistant a la corrosion WO1988006639A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPI064987 1987-03-03
AUPI0649 1987-03-03

Publications (1)

Publication Number Publication Date
WO1988006639A1 true WO1988006639A1 (fr) 1988-09-07

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Family Applications (1)

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PCT/AU1988/000060 WO1988006639A1 (fr) 1987-03-03 1988-03-03 Procede de formation d'un revetement resistant a la corrosion

Country Status (5)

Country Link
EP (1) EP0347420A4 (fr)
JP (1) JPH02502655A (fr)
CA (1) CA1292155C (fr)
NZ (1) NZ223740A (fr)
WO (1) WO1988006639A1 (fr)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5194138A (en) * 1990-07-20 1993-03-16 The University Of Southern California Method for creating a corrosion-resistant aluminum surface
EP0534120A1 (fr) * 1991-09-27 1993-03-31 Hughes Aircraft Company Procédé et composition sans chrome pour protéger l'aluminium
US5362335A (en) * 1993-03-25 1994-11-08 General Motors Corporation Rare earth coating process for aluminum alloys
WO1995008008A1 (fr) * 1993-09-13 1995-03-23 Commonwealth Scientific And Industrial Research Organisation Traitement de metaux par une solution de nettoyage contenant des ions acides de terres rares
WO1995034693A1 (fr) * 1994-06-10 1995-12-21 Commonwealth Scientific And Industrial Research Organisation Couche de conversion, procede et solution utilises pour sa formation
WO1996011290A1 (fr) * 1994-10-07 1996-04-18 Mcmaster University Procede de traitement a base d'elements terres rares pourameliorer la resistance a la corrosion des metaux et alliages
EP0804633A1 (fr) * 1994-11-11 1997-11-05 Commonwealth Scientific And Industrial Research Organisation Procede et solution destines a la formation d'une couche de conversion sur une surface metallique
US5932083A (en) * 1997-09-12 1999-08-03 The Curators Of The University Of Missouri Electrodeposition of cerium-based coatings for corrosion protection of aluminum alloys
US6068711A (en) * 1994-10-07 2000-05-30 Mcmaster University Method of increasing corrosion resistance of metals and alloys by treatment with rare earth elements
US6248184B1 (en) 1997-05-12 2001-06-19 The Boeing Company Use of rare earth metal salt solutions for sealing or anodized aluminum for corosion protection and paint adhesion
WO2001071058A1 (fr) 2000-03-20 2001-09-27 Commonwealth Scientific And Industrial Research Organisation Procede et solution permettant la production d'un revetement par conversion sur une surface metallique i
WO2001071059A1 (fr) 2000-03-20 2001-09-27 Commonwealth Scientific And Industrial Research Organisation Procede et solution destines a mettre en oeuvre un revetement de conversion sur une surface metallique ii
ES2211348A1 (es) * 2002-12-27 2004-07-01 Universidad De Cadiz Procedimiento para la obtencion de capas de conversion libres de cromatos sobre aleaciones de aluminio.
US6818116B2 (en) 2002-08-08 2004-11-16 The Curators Of The University Of Missouri Additive-assisted cerium-based electrolytic coating process for corrosion protection of aluminum alloys
US7048807B2 (en) 2002-08-08 2006-05-23 The Curators Of The University Of Missouri Cerium-based spontaneous coating process for corrosion protection of aluminum alloys
EP1666634A1 (fr) 2004-12-01 2006-06-07 Deft, Inc. Revêtements par conversion résistants à la corrosion
WO2007032702A1 (fr) * 2005-09-16 2007-03-22 Gosudarstvennoye Obrazovatelnoye Uchrezhdeniye Vysshego Professionalnogo Obrazovaniya (Gouvpo) 'udmurtskij Gosudarstvennyj Universitet' Procedes pour ameliorer la durete d'articles
US7241371B2 (en) 2000-08-17 2007-07-10 The Curators Of University Of Missouri Additive-assisted, cerium-based, corrosion-resistant e-coating
WO2010032702A1 (fr) 2008-09-17 2010-03-25 株式会社放電精密加工研究所 Solution aqueuse de finition noire par traitement de conversion chimique d'une surface en zinc ou en alliage de zinc, et procédé de formation d'un film de revêtement antirouille noirci à l'aide de la solution aqueuse
EP2570515A2 (fr) 2011-09-16 2013-03-20 Deft, Inc. Compositions de revêtement de prétraitement résistant à la corrosion
US8609755B2 (en) 2005-04-07 2013-12-17 Momentive Perfomance Materials Inc. Storage stable composition of partial and/or complete condensate of hydrolyzable organofunctional silane
TWI477648B (zh) * 2010-12-30 2015-03-21 Hon Hai Prec Ind Co Ltd 鋁及鋁合金表面防腐處理方法及其製品
US9290846B2 (en) 2014-03-05 2016-03-22 The Boeing Company Chromium-free conversion coating
US9347134B2 (en) 2010-06-04 2016-05-24 Prc-Desoto International, Inc. Corrosion resistant metallate compositions

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
US6190780B1 (en) 1996-02-05 2001-02-20 Nippon Steel Corporation Surface treated metal material and surface treating agent
DE69732102T2 (de) * 1996-02-05 2006-03-16 Nippon Steel Corp. Oberflächenbehandelter metallischer korrosionsbeständiger Werkstoff und Mittel zur Oberflächenbehandlung
CN110670054B (zh) * 2019-10-11 2021-06-29 青海民族大学 一种镁合金表面铈酸盐转化修复膜及其制备方法

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GB1418957A (en) * 1972-05-11 1975-12-24 Lummus Co Protective coating of metals
US4297246A (en) * 1977-11-01 1981-10-27 United Kingdom Atomic Energy Authority Method of producing dense refractory oxide coatings on metallic substrates and the production of catalysts from the coated substrates
US4328285A (en) * 1980-07-21 1982-05-04 General Electric Company Method of coating a superalloy substrate, coating compositions, and composites obtained therefrom
AU3294784A (en) * 1983-09-15 1985-03-21 British Petroleum Company Plc, The Inhibiting corrosion in aqueous systems
AU3566184A (en) * 1983-11-19 1985-05-23 Alain James Duggan Corrosion resistant boiler tubes

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DE863280C (de) * 1951-07-02 1953-01-15 American Chem Paint Co Verfahren und Mittel zur Erhoehung der Korrosionsfestigkeit von Metalloberflaechen
CA1228000A (fr) * 1981-04-16 1987-10-13 David E. Crotty Solution et procede de passivation, donnant un aspect chrome
JPS60200972A (ja) * 1984-03-23 1985-10-11 Hitachi Ltd ジルコニウムまたはジルコニウム合金の防食方法

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GB1418957A (en) * 1972-05-11 1975-12-24 Lummus Co Protective coating of metals
US4297246A (en) * 1977-11-01 1981-10-27 United Kingdom Atomic Energy Authority Method of producing dense refractory oxide coatings on metallic substrates and the production of catalysts from the coated substrates
US4328285A (en) * 1980-07-21 1982-05-04 General Electric Company Method of coating a superalloy substrate, coating compositions, and composites obtained therefrom
AU3294784A (en) * 1983-09-15 1985-03-21 British Petroleum Company Plc, The Inhibiting corrosion in aqueous systems
AU3566184A (en) * 1983-11-19 1985-05-23 Alain James Duggan Corrosion resistant boiler tubes

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* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Volume 103, No. 12, issued 1985 September 9, D.R. ARNOTT et al, 'Auger and XPS Studies of Cerium Corrosion Inhibition on 7075 Aluminium Alloy', see page 237, column 2, the Abstract No. 91568a, Appl. Surf. Sci. 1985, 22-23(1), 236-51 (Eng.) *
CHEMICAL ABSTRACTS, Volume 106, No. 8, issued 1987, February 23 (Columbus, Ohio, USA), B.R.W. HINTON et al, 'Cerium Conversion Coatings for the Corrosion Protection of Aluminium', see page 256, column 1, the Abstract No. 54262n, Mater. Forum 1986, 9(3), 162-75 (Eng.) *
CHEMICAL ABSTRACTS, Volume 96, No. 26, issued 1982, 28 June, M.J. BENNET et al, 'Influence of Thermal and Mechanical Stresses on the Improvement by Ceramic Protective Surface Coatings of the Oxidation Behaviour of a 20% / 25% Niclel/Niobium Stabilised Stainless Steel', see page 224, column 2, the Abstract No. 221202b, Met. Corros. Proc.: Int. Congr. Met. Corros./, 8th 1981,2, 1026-31 (Eng.) *
See also references of EP0347420A4 *

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5194138A (en) * 1990-07-20 1993-03-16 The University Of Southern California Method for creating a corrosion-resistant aluminum surface
EP0534120A1 (fr) * 1991-09-27 1993-03-31 Hughes Aircraft Company Procédé et composition sans chrome pour protéger l'aluminium
US5362335A (en) * 1993-03-25 1994-11-08 General Motors Corporation Rare earth coating process for aluminum alloys
WO1995008008A1 (fr) * 1993-09-13 1995-03-23 Commonwealth Scientific And Industrial Research Organisation Traitement de metaux par une solution de nettoyage contenant des ions acides de terres rares
US6503565B1 (en) 1993-09-13 2003-01-07 Commonwealth Scientific And Industrial Research Organisation Metal treatment with acidic, rare earth ion containing cleaning solution
WO1995034693A1 (fr) * 1994-06-10 1995-12-21 Commonwealth Scientific And Industrial Research Organisation Couche de conversion, procede et solution utilises pour sa formation
US6022425A (en) * 1994-06-10 2000-02-08 Commonwealth Scientific And Industrial Research Organisation Conversion coating and process and solution for its formation
US6068711A (en) * 1994-10-07 2000-05-30 Mcmaster University Method of increasing corrosion resistance of metals and alloys by treatment with rare earth elements
WO1996011290A1 (fr) * 1994-10-07 1996-04-18 Mcmaster University Procede de traitement a base d'elements terres rares pourameliorer la resistance a la corrosion des metaux et alliages
US6406562B1 (en) 1994-10-07 2002-06-18 Mcmaster University Method of increasing corrosion resistance of metals and alloys by treatment with rare earth elements
EP0804633A1 (fr) * 1994-11-11 1997-11-05 Commonwealth Scientific And Industrial Research Organisation Procede et solution destines a la formation d'une couche de conversion sur une surface metallique
EP0804633A4 (fr) * 1994-11-11 1998-02-25 Commw Scient Ind Res Org Procede et solution destines a la formation d'une couche de conversion sur une surface metallique
US6206982B1 (en) 1994-11-11 2001-03-27 Commonwealth Scientific And Industrial Research Organisation Process and solution for providing a conversion coating on a metal surface
US6248184B1 (en) 1997-05-12 2001-06-19 The Boeing Company Use of rare earth metal salt solutions for sealing or anodized aluminum for corosion protection and paint adhesion
US5932083A (en) * 1997-09-12 1999-08-03 The Curators Of The University Of Missouri Electrodeposition of cerium-based coatings for corrosion protection of aluminum alloys
WO2001071059A1 (fr) 2000-03-20 2001-09-27 Commonwealth Scientific And Industrial Research Organisation Procede et solution destines a mettre en oeuvre un revetement de conversion sur une surface metallique ii
EP1198615A1 (fr) * 2000-03-20 2002-04-24 Commonwealth Scientific And Industrial Research Organisation Procede et solution destines a mettre en oeuvre un revetement de conversion sur une surface metallique ii
EP1198614A1 (fr) * 2000-03-20 2002-04-24 Commonwealth Scientific And Industrial Research Organisation Procede et solution permettant la production d'un revetement par conversion sur une surface metallique i
WO2001071058A1 (fr) 2000-03-20 2001-09-27 Commonwealth Scientific And Industrial Research Organisation Procede et solution permettant la production d'un revetement par conversion sur une surface metallique i
US6755917B2 (en) 2000-03-20 2004-06-29 Commonwealth Scientific And Industrial Research Organisation Process and solution for providing a conversion coating on a metallic surface II
EP1198614A4 (fr) * 2000-03-20 2008-03-05 Commw Scient Ind Res Org Procede et solution permettant la production d'un revetement par conversion sur une surface metallique i
US6773516B2 (en) 2000-03-20 2004-08-10 Commonwealth Scientific And Industrial Research Organisation Process and solution for providing a conversion coating on a metallic surface I
EP1198615A4 (fr) * 2000-03-20 2007-12-26 Commw Scient Ind Res Org Procede et solution destines a mettre en oeuvre un revetement de conversion sur une surface metallique ii
US7241371B2 (en) 2000-08-17 2007-07-10 The Curators Of University Of Missouri Additive-assisted, cerium-based, corrosion-resistant e-coating
US6818116B2 (en) 2002-08-08 2004-11-16 The Curators Of The University Of Missouri Additive-assisted cerium-based electrolytic coating process for corrosion protection of aluminum alloys
US7048807B2 (en) 2002-08-08 2006-05-23 The Curators Of The University Of Missouri Cerium-based spontaneous coating process for corrosion protection of aluminum alloys
ES2211348A1 (es) * 2002-12-27 2004-07-01 Universidad De Cadiz Procedimiento para la obtencion de capas de conversion libres de cromatos sobre aleaciones de aluminio.
WO2004059035A1 (fr) * 2002-12-27 2004-07-15 Universidad De Cádiz Obtention de couches de conversion exemptes de chromates sur des alliages d'aluminium
EP1666634A1 (fr) 2004-12-01 2006-06-07 Deft, Inc. Revêtements par conversion résistants à la corrosion
US7452427B2 (en) 2004-12-01 2008-11-18 Deft, Inc. Corrosion resistant conversion coatings
US8609755B2 (en) 2005-04-07 2013-12-17 Momentive Perfomance Materials Inc. Storage stable composition of partial and/or complete condensate of hydrolyzable organofunctional silane
US10041176B2 (en) 2005-04-07 2018-08-07 Momentive Performance Materials Inc. No-rinse pretreatment methods and compositions
WO2007032702A1 (fr) * 2005-09-16 2007-03-22 Gosudarstvennoye Obrazovatelnoye Uchrezhdeniye Vysshego Professionalnogo Obrazovaniya (Gouvpo) 'udmurtskij Gosudarstvennyj Universitet' Procedes pour ameliorer la durete d'articles
WO2010032702A1 (fr) 2008-09-17 2010-03-25 株式会社放電精密加工研究所 Solution aqueuse de finition noire par traitement de conversion chimique d'une surface en zinc ou en alliage de zinc, et procédé de formation d'un film de revêtement antirouille noirci à l'aide de la solution aqueuse
CN102149848A (zh) * 2008-09-17 2011-08-10 株式会社放电精密加工研究所 锌或锌合金表面的黑化化学转换处理用水溶液和使用该处理用水溶液的黑化防锈涂膜形成方法
US9347134B2 (en) 2010-06-04 2016-05-24 Prc-Desoto International, Inc. Corrosion resistant metallate compositions
TWI477648B (zh) * 2010-12-30 2015-03-21 Hon Hai Prec Ind Co Ltd 鋁及鋁合金表面防腐處理方法及其製品
EP2570515A2 (fr) 2011-09-16 2013-03-20 Deft, Inc. Compositions de revêtement de prétraitement résistant à la corrosion
US10876211B2 (en) 2011-09-16 2020-12-29 Prc-Desoto International, Inc. Compositions for application to a metal substrate
US9290846B2 (en) 2014-03-05 2016-03-22 The Boeing Company Chromium-free conversion coating

Also Published As

Publication number Publication date
NZ223740A (en) 1989-06-28
EP0347420A4 (fr) 1990-02-26
EP0347420A1 (fr) 1989-12-27
CA1292155C (fr) 1991-11-19
JPH02502655A (ja) 1990-08-23

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