Method of making an anodic phosphate ester duplex coating on a v

Details Method of making an anodic phosphate ester duplex coating on a v Method of making an anodic phosphate ester duplex coating on a v

1989-10-16

1992-04-07

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating predominantly single metal or alloy substrate of...

156151, 205201, 205220, 205318, 205332, C25D 1106

Patent

active

051025078

ABSTRACT:
A process is disclosed for treating the surface of a valve metal such as aluminum to form a two layer protective coating thereon using an anodizing bath consisting essentially of an aqueous solution having a concentration ranging from about 0.001 molar to a saturated solution of a phosphorus-containing compound selected from the class consisting of a phosphorus acid ester and salts thereof. A non-porous barrier valve metal oxide layer is formed on a surface of the valve metal, and a functionalized layer comprised of a phosphate ester is formed on the oxide layer. The functionalized layer protects the oxide layer against chemical attack by the electrolyte during anodizing

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