Non-chromium coatings for aluminum
First Claim
1. Process for preparing coatings on aluminum to improve the adhesive bonding and corrosion resistance which comprises treating the aluminum with an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 at temperatures ranging from ambient up to about 212°
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said acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of at least one fluorometallate selected from the group consisting of hexafluorozirconates, tetrafluoroborates, hexafluorosilicates, hexafluorotitanates, and heptafluorotantalates, from about 0.1 up to the solubility limit of at least one cationic zinc compound, from about 0.0 to 10 grams of a water soluble thickener, and 0.0 to 10 grams of a water soluble surfactant.
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Accused Products
Abstract
Composition and process for treating aluminum, aluminum alloys and anodized aluminum substrates to improve the corrosion resistance and adhesive bonding strength of the aluminum substrates. The process comprises pre- or post-treating said aluminum with an acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of at least one fluorometallate, about 0.1 gram up to the solubility limit of a water soluble cationic or divalent zinc compound and, optionally, effective amounts of water soluble thickeners and/or surfactants.
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Citations
21 Claims
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1. Process for preparing coatings on aluminum to improve the adhesive bonding and corrosion resistance which comprises treating the aluminum with an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 at temperatures ranging from ambient up to about 212°
- F.;
said acidic aqueous solution comprising, per liter of solution, from about 0.1 to 22 grams of at least one fluorometallate selected from the group consisting of hexafluorozirconates, tetrafluoroborates, hexafluorosilicates, hexafluorotitanates, and heptafluorotantalates, from about 0.1 up to the solubility limit of at least one cationic zinc compound, from about 0.0 to 10 grams of a water soluble thickener, and 0.0 to 10 grams of a water soluble surfactant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17)
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10. Process for preparing coatings on aluminum to improve the adhesive bonding and corrosion resistance of the aluminum which comprises treating the aluminum with an acidic aqueous solution having a pH ranging from about 3.7 to 4.0 at temperatures ranging from ambient up to about 160°
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said acidic aqueous solution comprising, per liter of solution, from about 1.0 to 12 grams of an alkali metal fluorometallate, from about 0.1 up to the solubility limits of at least one cationic zinc salt, from 0.5 to 1.5 grams of a water soluble thickener and from 0.5 to 1.5 grams of a water soluble surfactant. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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- 18. Compositions for improving the adhesion bonding and corrosion resistance of aluminum, aluminum alloy, and anodized aluminum which comprise an acidic aqueous solution having a pH ranging from about 2.5 to 5.5, and per liter of solution, from about 0.1 to 22 grams of at least one fluorometallate selected from the group consisting of hexafluorozirconates, tetrafluoroborates, hexafluorosilicates, hexafluorotitanates, and heptafluorotantalates, from about 0.1 up to the solubility limit of a cationic zinc compound, from about 0.0 to 10 grams of at least one water soluble thickener and from 0.0 to 10 grams of at least one water soluble surfactant.
Specification