Corrosion resistant metallate compositions
First Claim
1. A composition for application to a metal substrate, the composition comprising:
- an aqueous carrier;
hexafluorozirconate; and
yttrium nitrate, wherein the yttrium nitrate is present in a sufficient amount so that the composition is stabilized as a suspension with no precipitate, the amount of the yttrium nitrate in the composition is greater than an amount of the hexafluorozirconate in the composition, and the composition is substantially free of Group 5 through Group 12 metals.
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Accused Products
Abstract
A composition for application to a metal substrate comprising at least one metallate compound comprising hexafluorzirconate, zirconyl nitrate, and/or yttrium nitrate is provided. The composition may further comprise additives that promote corrosion resistance of the metal substrate, or the adhesion of subsequent coatings, such as one or more rare earth element salts; allontoin, polyvinylpyrrolidone, surfactants, and other additives and co-inhibitors. A metal substrate such as an aluminum or an aluminum alloy substrate coated with a metallate composition according to the present invention is also provided. A process for preparing a coating on a metal substrate to improve the corrosion resistance of the substrate or improve the adhesion of a subsequent coating is also provided. The process comprises treating the metal substrate with an aqueous solution comprising a metallate compound. The process may further comprise one or more pre-treating the substrate, coating the metal substrate with an oxidizing agent and/or coating the metal substrate with one or more rare earth element salts. A process for preparing the metallate coatings of the invention is also provided.
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Citations
22 Claims
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1. A composition for application to a metal substrate, the composition comprising:
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an aqueous carrier; hexafluorozirconate; and yttrium nitrate, wherein the yttrium nitrate is present in a sufficient amount so that the composition is stabilized as a suspension with no precipitate, the amount of the yttrium nitrate in the composition is greater than an amount of the hexafluorozirconate in the composition, and the composition is substantially free of Group 5 through Group 12 metals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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13. A composition for application to a metal substrate, the composition consisting of:
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an aqueous carrier; hexafluorozirconate; and yttrium nitrate, wherein the yttrium nitrate is present in a sufficient amount so that the composition is stabilized as a suspension, and the amount of the yttrium nitrate in the composition is greater than an amount of the hexafluorozirconate in the composition.
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Specification