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US 7,001,533 B2Granted
Chromate-free method for surface etching of aluminum and aluminum alloys
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.
Claims5
A method of etching aluminum and/or an aluminum alloy comprising:
- immersing the aluminum and/or aluminum alloy in a bath comprising distilled and/or deionized water, sulfuric acid, and sodium metatitanate or potassium titanate.
Dependencies are inferred from the claim text.