Ceramic deposition on aluminum
AssigneeAmerican Hoechst Corporation
InventorJohn E. Walls
Life of this patent
Estimating the term…
Abstract
An aluminum substrate is electrochemically or thermally deposited with a ceramic surface coating comprising an organic acid, such as polyvinyl phosphonic acid, and an alkaline earth silicate or borate.
Claims19
An article comprising an aluminum sheet, and a coating on said sheet, said coating comprising a composition produced by the method of
- (a) admixing a compound selected from the group consisting of silicates, tetraborates and pentaborates having monovalent cations, with
- (b) the product obtained by titrating an aqueous solution of one or more compounds selected from the group consisting of organic sulfonic, phosphonic, phosphoric and tribasic or higher functionality carboxylic acids with a monovalent alkali until an alkaline pH is attained provided said titration product is selected such that it does not form a precipitate with the compound of part (a).
A method for producing an article comprising treating an aluminum sheet for at least about 30 seconds with a coating composition having a temperature in the range of from about 60.degree. C. to about 100.degree. C., said coating comprising a composition produced by the method of
- (a) admixing a compound selected from the group consisting of silicates, tetraborates and pentaborates having monovalent cations, with
- (b) the product obtained by titrating an aqueous solution of one or more compounds selected from the group consisting of organic sulfonic, phosphonic, phosphoric and tribasic or higher functionality carboxylic acids with a monovalent alkali until an alkaline pH is attained provided said titration product is selected such that it does not form a precipitate with the compound of part (a).
A method for producing an article comprising treating an aluminum sheet, by electrodepositing a coating on said sheet, said coating comprising a composition produced by the method of
- (a) admixing a compound selected from the group consisting of silicates, tetraborates and pentaborates having monovalent cations, with
- (b) the product obtained by titrating an aqueous solution of one or more compounds selected from the group consisting of organic sulfonic, phosphonic, phosphoric and tribasic or higher functionality carboxylic acids with a monovalent alkali until an alkaline pH is attained provided said titration product is selected such that it does not form a precipitate with the compound of part (a).
Dependencies are inferred from the claim text.