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US 5,205,922 AGranted
Formation of pitting resistant anodized films on aluminum
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJohn S. Ahearn, Jr., Guy D. Davis, William C. Moshier
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Abstract
A method and apparatus for retarding the pitting of aluminum by coating the luminum with a film which includes molybdenium oxide. The aluminum material is preexposed to a molybdate solution before anadizing in a sodium tartrate solution.
Claims7
A method of protecting aluminum from pitting, comprising the steps of:
- (a) growing an oxide film on aluminum and (b) incorporating a molybdenum inhibitor into said film by anodizing the aluminum in the presence of a molybdate inhibitor in solution.
A method of protecting aluminum from pitting, comprising the steps of:
- obtaining a solution of sodium tartrate and sodium molybdate with a pH greater than 2, and anodizing said aluminum in said solution.
A method of protecting aluminum form pitting, comprising the steps of:
- (a) growing an oxide film on aluminum and (b) incorporating an inhibitor into said film by anodizing the aluminum in the presence of a sodium molybdate inhibitor in a solution of sodium tartate which solution has a pH of at least 2.
Dependencies are inferred from the claim text.