EP0356855B1 - Prétraitement de surfaces en aluminium ou alliages d'aluminium à revêtir avec des matériaux organiques sans utilisation de chrome - Google Patents

Prétraitement de surfaces en aluminium ou alliages d'aluminium à revêtir avec des matériaux organiques sans utilisation de chrome Download PDF

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Publication number
EP0356855B1
EP0356855B1 EP89115352A EP89115352A EP0356855B1 EP 0356855 B1 EP0356855 B1 EP 0356855B1 EP 89115352 A EP89115352 A EP 89115352A EP 89115352 A EP89115352 A EP 89115352A EP 0356855 B1 EP0356855 B1 EP 0356855B1
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Prior art keywords
aluminium
atoms
unit
concentration
aluminum
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EP89115352A
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German (de)
English (en)
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EP0356855A2 (fr
EP0356855A3 (en
Inventor
Cornelia Finnenthal
Wolf-Achim Dr. Roland
Roland Dr. Morlock
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Gerhard Collardin GmbH
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Gerhard Collardin GmbH
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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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/18—Pretreatment of the material to be coated
    • C23C18/1803—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces
    • C23C18/1824—Pretreatment of the material to be coated of metallic material surfaces or of a non-specific material surfaces by chemical pretreatment
    • C23C18/1837—Multistep pretreatment
    • C23C18/1844—Multistep pretreatment with use of organic or inorganic compounds other than metals, first
    • 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
    • C23C22/34—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 containing fluorides or complex fluorides
    • 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
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

Definitions

  • the invention relates to a process for the pretreatment of surfaces made of aluminum or aluminum alloys, in which first the cleaned, pickled and decapitated surfaces are brought into contact with an aqueous solution and / or dispersion of aluminum-zirconium complexes, the surfaces being subjected to a subsequent treatment with aqueous solutions, emulsions and / or dispersions of one or more inorganic and / or organic film formers before coating with organic materials.
  • DE-A-32 00 245 relates to a method for treating surfaces made of aluminum or aluminum alloys, which is also carried out in two steps.
  • a chemical coating is formed on the aluminum surface to be treated, solutions based on chromic acid, chromate, dichromate, chromic acid-phosphoric acid, phosphoric acid, phosphates, titanates, titanium tannic acid or zirconium fluoride being used.
  • the chemical covering produced is treated with solutions based on silica, silicates and / or colloidal silica.
  • the surfaces of aluminum bodies treated in this way, in particular aluminum parts in evaporators of air conditioning systems, have improved hydrophilic properties.
  • wash primers reaction primers
  • Page 669 also reports on the generation of adhesive layers on aluminum surfaces. Here it is said that the surfaces are treated with solutions based on sodium carbonate and sodium chromate and then with bichromate or water glass solutions. The layers produced in this way are also intended to serve as anchoring layers for subsequent film runs or coatings.
  • the actual top coat is composed of different layers - prime coat, second coat and finish coat -, the prime coats being based on polyvinyl butyral, acrylates, polyurethanes, vinyl epoxy compounds or phenolic resins and containing corrosion-protecting pigments such as zinc chromate or titanium dioxide can.
  • the conversion layers significantly improve the adhesion and the corrosion-inhibiting effect of subsequent coatings with organic materials, such as paints, powder layers or foils. Therefore, the conversion layers are used in particular on aluminum, its alloys and on zinc as corrosion-resistant coatings without a subsequent coating.
  • Another one A well-known area of application of chromates and chromic acid is the rinsing of zinc phosphate and iron phosphate conversion layers on steel and galvanized steel.
  • this aftertreatment brings about a significant improvement in the adhesion of subsequent coatings with organic materials and an increase in the corrosion resistance of the coated metallic surfaces.
  • chromium (VI) compounds Due to the toxic properties of chromium (VI) compounds, the wastewater generated in the control and disposal of the baths must be subjected to a special, complex treatment.
  • organometallic compounds Due to recent developments, however, is a class of substances for use in aqueous solutions for pretreating metals before coating with organic materials become interesting, which are organometallic compounds.
  • organometallic compounds In the past, the use of organometallic compounds in aqueous solution was prohibited because practically all known representatives of this class of substances hydrolyzed to a greater or lesser extent in aqueous solution.
  • US-A-4 650 526 describes a method for treating phosphated metal surfaces before coating them with organic materials.
  • organometallic compounds in rinse solutions to improve the adhesion of subsequent organic coatings is described.
  • These are aluminum-zircon complexes, which are sold by Cavedon Chemical Co. under the name "CAVCOMOD”.
  • CAVCOMOD Cavedon Chemical Co.
  • the preparation of the aluminum-zirconium complexes is described in US Patents 4,539,048 and 4,539,049.
  • the starting point of the present invention was the aluminum-zirconium complexes described in US Pat. No. 4,650,526. It was shown that treatment of aluminum with the aluminum-zirconium complexes alone did not give acceptable adhesion and corrosion protection values compared to a "classic" pretreatment based on chromium (VI) compounds.
  • Another object of the present invention was to improve the method for pretreating surfaces made of aluminum or aluminum alloys before coating with organic materials. Another object of the present invention was to achieve acceptable adhesion and corrosion protection values for such surfaces before coating with organic materials.
  • the above-mentioned objects are achieved by the combined use of the above-mentioned aluminum-zirconium complexes with an organic and / or inorganic film former. Conversion layers with very good adhesion and improved corrosion protection properties for subsequent organic coatings can be produced on surfaces made of aluminum and its alloys.
  • the above-mentioned aluminum-zirconium complexes are used in a concentration of 0.05 to 50 g / l as an aqueous solution and / or dispersion.
  • the contact time is 1 sec to 5 min at a bath temperature of 10 to 60 ° C.
  • the organic film formers can be brought into contact with the surfaces by spraying, dipping, flooding, rolling and / or rolling up.
  • the contact time of the aqueous solutions, emulsions and / or dispersions containing the organic film formers in one embodiment is 1 sec to 5 min at a bath temperature in the range from 10 to 60 ° C.
  • the inorganic film formers are brought into contact with the metal surfaces to be coated in the form of aqueous solutions or dispersions in the course of 1 sec to 5 min at a temperature of 10 to 60 ° C.
  • the inorganic film formers can be brought into contact by spraying, dipping, Flooding, rolling and / or rolling with the surface happen.
  • free and / or complex fluorides are added to the solutions containing aluminum-zirconium complexes in a concentration of 0.01 to 1 g / l.
  • zircoaluminate solution The active contents of the commercially available solutions (hereinafter zircoaluminate solution) are between 20 - 24%.
  • Aluminum sheets (Al 99.5) format 100 x 200 x 0.7 mm were treated as follows: 1) Dipping in a conventional alkaline cleaner (RIDOLINE C 1515, containing sodium hydroxide, phosphates, complexing agents and nonionic surfactants). Concentration: 3% (wt.) In fresh water Time: 3 min. Temp .: 60 ° C 2) Dip rinse in fresh water Time: 1 min Temp .: RT (room temperature) 3) Remove the oxide skin by dipping in a chromium-free agent (DEOXIDIZER 395 H, containing complex fluorides in acid solution).
  • the sheets were then subjected to adhesion and corrosion protection tests.
  • a continuous cut is made on the metal sheets, down to the metal surface, on which the through Corrosion caused by infiltration is determined in mm.
  • the sheets were dried as in reference example I according to 8).
  • the sheets were painted as in Reference Example I and subjected to the same adhesion and corrosion tests. The values are shown in Table 3.
  • the concentration of the polyacrylic acid used was 1 g / l.
  • the concentration of silicon dioxide in the immersion sink was 1.5 g / l.
  • the basic monomers are butyl acrylate and methyl methacrylate, the dispersion in the delivery form has a solids content of 50%, the pH is 2.2 ⁇ 0.5, the average particle diameter is 0.15 ⁇ m.
  • Aerosil 200 As in Reference Example IV and Examples IV, but Degussa was used as Aerosil 200 silicon dioxide. Aerosil 200 has the following characteristics: Average size of the particles: 12 nm, surface according to BET 200 m2 / g, pH value in 4% aqueous dispersion: 3.6-4.3. Concentration: 3 g / l Time: 0.5 min Temp .: RT
  • the adhesion of the organic coating is improved both compared to the untreated metal sheets and compared to the standard process.
  • the corrosion protection values are significantly closer to the values achieved with the standard process than the values of the untreated sheets.

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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)
  • Inorganic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
  • Chemically Coating (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Claims (8)

  1. Procédé de prétraitement de surfaces en aluminium ou en alliages d'aluminium avec une solution et/ou une dispersion aqueuse de complexes aluminium/zirconium, qui peuvent être obtenus comme produit de réaction d'une unité d'aluminium chélatée, d'un ligand organo-fonctionnel et d'un halogénure de zirconyle, procédé dans lequel le ligand organofonctionnel est lié chimiquement à l'unité d'aluminium chélatée et à l'unité de zirconium, préalablement à un recouvrement connue en soi des surfaces avec des matériaux organiques, procédé caractérisé en ce que :
    a) on rince à l'eau les surfaces nettoyées, mordancées et décapées et sans étape intermédiaire supplémentaire, on met en contact avec une solution et/ou dispersion aqueuse du complexe aluminium/zirconium.
    b) on rince à nouveau à l'eau les surfaces ainsi traitées et on soumet à un traitement subséquent avec des solutions, émulsions et/ou dispersions d'un ou plusieurs agents filmogènes minéraux et/ou organiques pour lequel on met en oeuvre
    - comme agent filmogène minéral le dioxyde de silicium, le dioxyde de titane, et/ou l'oxyde d'aluminium à une concentration de 0,05 à 5 g/l et
    - comme agent filmogène organique de l'acide polyacrylique, des polyacrylates, des polyesters, des polyuréthanne, et/ou des composés polyépoxydiques à une concentration de 0,01 à 2 g/l, respectivement rapportés aux solutions, émulsions et/ou dispersions aqueuses.
    c) et ensuite on effectue le recouvrement avec des matériaux organiques.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on met en contact les complexes aluminium/zirconium avec les surfaces, par pulvérisation, par immersion, par trempage, par cylindrage et/ou enroulage.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que :
    (1) l'unité d'aluminium est représentée par la formule générale I



            Al₂(OR₁O)aAbBc   (I)



    dans laquelle,

    A ou B représentent OH, ou du fluor, du chlore, du brome, et/ou de l'iode, a, b et c sont des nombres entiers et 2a + b + c est égal à 6
    Figure imgb0017
     et (OR₁O) représente :
    a) un groupe α, β ou α, γ glycol et R₁ un radical alcoyle ayant de 1 à 6 atomes de carbone ou
    b) un reste d'acide α -hydroxy carboxylique de formule générale II



            -OCH(R₃) COO-   (II)



    dans laquelle R₃ représente de l'hydrogène ou un radical alcoyle ayant de 1 à 4 atomes de carbone.
    (2)le ligand organo-fonctionnel représente :
    - un radical alcoyle ou alcényle, un acide alcoyl- ou aralcoylcarboxylique avec respectivement de 2 à 36 atomes de carbone,
    - un acide carboxylique fonctionnalisé par un radical amine, ayant de 2 à 18 atomes de carbone,
    - un acide carboxylique dibasique ayant de 2 à 18 atomes de carbone,
    - un anhydride d'acide d'un acide dibasique ayant de 2 à 18 atomes de carbone,
    - un acide carboxylique fonctionnalisé par un radical mercapto, ayant de 2 à 18 atomes de carbone ou un acide carboxylique fonctionnalisé par un groupe époxy ayant de 2 à 18 atomes de carbone et,
    (3) l'unité d'halogénure de zirconyle est représentée par la formule générale III



            ZrAdBe   (III)



    dans laquelle

    A et B sont définis comme ci-dessus et d et e respectivement représentent des valeurs numériques, dans laquelle la somme d + e est égale à 4 et le rapport de la quantité de substance de l'unité d'aluminium chélatée à l'unité d'halogénure de zirconyle s'élève de 1,5 à 10 et le rapport de la quantité de substance du ligand organo-fonctionnel à la teneur totale en métal s'élève de 0,05 à 3.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce que la concentration des complexes aluminium/zirconium s'élève de 0,05 à 50 g/l.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que le temps de contact des complexes aluminium/zirconium avec les surfaces s'élève de 1 sec. à 5 min pour une température de bain allant de 10 à 60°C.
  6. Procédé selon les revendications 1 à 5, caractérisé en ce que l'on ajoute aux solutions contenant les complexes aluminium/zirconium, des fluorures libres et/ou complexes à une concentration allant de 0,01 à 1 g/l.
  7. Procédé selon les revendications 1 à 6, caractérisé en ce que le temps de contact d'agents filmogènes minéraux et/ou organiques s'élève de 1 sec. à 5 min pour une température de 10 à 60°C.
  8. Procédé selon les revendications 1 à 7, caractérisé en ce que l'on met en contact les agents filmogènes minéraux et/ou organiques avec les surfaces par pulvérisation, par immersion, par trempage, par cylindrage et/ou par enroulage.
EP89115352A 1988-08-27 1989-08-19 Prétraitement de surfaces en aluminium ou alliages d'aluminium à revêtir avec des matériaux organiques sans utilisation de chrome Expired - Lifetime EP0356855B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89115352T ATE83508T1 (de) 1988-08-27 1989-08-19 Chromfreies verfahren zur vorbehandlung von oberflaechen aus aluminium oder aluminiumlegierungen vor einer beschichtung mit organischen materialien.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3829154A DE3829154A1 (de) 1988-08-27 1988-08-27 Chromfreies verfahren zur vorbehandlung von metallischen oberflaechen vor einer beschichtung mit organischen materialien
DE3829154 1988-08-27

Publications (3)

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EP0356855A2 EP0356855A2 (fr) 1990-03-07
EP0356855A3 EP0356855A3 (en) 1990-11-14
EP0356855B1 true EP0356855B1 (fr) 1992-12-16

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Country Status (12)

Country Link
US (1) US5026440A (fr)
EP (1) EP0356855B1 (fr)
JP (1) JPH02118081A (fr)
AT (1) ATE83508T1 (fr)
AU (1) AU609327B2 (fr)
BR (1) BR8904315A (fr)
CA (1) CA1332801C (fr)
DE (2) DE3829154A1 (fr)
ES (1) ES2053886T3 (fr)
MX (1) MX170838B (fr)
TR (1) TR24778A (fr)
ZA (1) ZA896526B (fr)

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US6027579A (en) * 1997-07-07 2000-02-22 Coral Chemical Company Non-chrome rinse for phosphate coated ferrous metals
TW387926B (en) * 1998-05-15 2000-04-21 Nippon Dacro Shamrock Co Surface treatment agent for metals, surface treatment method for metals, and pre-coated steel plate
DE19921842A1 (de) * 1999-05-11 2000-11-16 Metallgesellschaft Ag Vorbehandlung von Aluminiumoberflächen durch chromfreie Lösungen
US6746719B2 (en) * 2000-10-13 2004-06-08 Atofina Chemicals, Inc. Process of priming a metal surface for attaching resin systems thereto utilizing aqueous emulsion of a polyfunctional epoxide compound as the primer
US6761932B2 (en) * 2002-08-23 2004-07-13 Basf Corporation Method to improve adhesion of primers to substrates
US6887308B2 (en) * 2003-01-21 2005-05-03 Johnsondiversey, Inc. Metal coating coupling composition
US7815751B2 (en) * 2005-09-28 2010-10-19 Coral Chemical Company Zirconium-vanadium conversion coating compositions for ferrous metals and a method for providing conversion coatings
JP5638191B2 (ja) * 2008-11-05 2014-12-10 日本パーカライジング株式会社 化成処理金属板およびその製造方法
FR2952557B1 (fr) * 2009-11-17 2011-12-23 Peugeot Citroen Automobiles Sa Procede de traitement de surface et de peinture de pieces metalliques, notamment des arbres de transmission de vehicules automobiles
KR102250420B1 (ko) * 2016-09-01 2021-05-13 생-고뱅 퍼포먼스 플라스틱스 코포레이션 전환 코팅 및 제조 방법
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Also Published As

Publication number Publication date
ES2053886T3 (es) 1994-08-01
ATE83508T1 (de) 1993-01-15
AU609327B2 (en) 1991-04-26
BR8904315A (pt) 1990-04-17
ZA896526B (en) 1990-04-25
EP0356855A2 (fr) 1990-03-07
DE58903014D1 (de) 1993-01-28
DE3829154A1 (de) 1990-03-01
JPH02118081A (ja) 1990-05-02
US5026440A (en) 1991-06-25
AU4080289A (en) 1990-03-01
CA1332801C (fr) 1994-11-01
TR24778A (tr) 1992-03-09
EP0356855A3 (en) 1990-11-14
MX170838B (es) 1993-09-20

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