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US 7,022,254 B2Granted
Chromate-free method for surface etching of titanium
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
Non-chromate solutions for treating and/or etching metals, particularly, aluminum, aluminum alloys, steel and titanium, and method of applying same wherein the solutions include either a titanate or titanium dioxide as a “drop-in replacement” for a chromium-containing compound in a metal surface etching solution that otherwise would contain chromium.
Claims6
A method of etching titanium comprising:
- immersing the titanium in a first bath comprising hydrochloric acid, phosphoric acid and hydrofluoric acid;
- and
- immersing the titanium in a second bath comprising titanium dioxide and deionized water.
Dependencies are inferred from the claim text.