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US 6,638,369 B1Granted
Non-chromate conversion coatings
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsWayne C. Tucker, Maria G. Medeiros, Richard Brown
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Abstract
A non-chromate conversion coating and method of applying same wherein the coating comprises a titanate, such as potassium titanate or sodium metatitanate, as a “drop-in replacement” for a chromate in an otherwise chromate-containing conversion coating.
Claims13
A non-chromate conversion coating comprising:
- sodium metatitanate, sodium fluoride, potassium ferricyanide and nitric acid.
A non-chromate conversion coating comprising:
- sodium metatitanate in a concentration ranging from greater than 0 to about 1 M;
- sodium fluoride in a concentration ranging from greater than 0 to about 1 M;
- potassium ferricyanide in a concentration ranging from greater than 0 to about 1 M;
- and
- nitric acid;
- wherein the coating has a pH ranging from about 1.0 to about 6.0.
3 more elements
A non-chromate conversion coating comprising:
- potassium titanate, sodium fluoride and nitric acid.
A non-chromate conversion coating comprising:
- potassium titanate in an amount ranging from about 4 g/l to about 8 g/l;
- sodium fluoride in an amount ranging from about 2 g/l to about 6 g/l;
- and
- nitric acid;
- wherein the coating has a pH ranging from about 1.0 to about 6.0.
2 more elements
Dependencies are inferred from the claim text.