Method of producing bright anodized finishes for high...

Details Method of producing bright anodized finishes for high... Method of producing bright anodized finishes for high...

2006-03-28

2006-03-28

Wong, Edna (Department: 1753)

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming nonelectrolytic coating after forming nonmetal...

C205S213000, C205S219000

Reexamination Certificate

active

07018521

ABSTRACT:
A method is disclosed for forming a clear anodized coating on an aluminum base alloy containing more than three percent by weight magnesium. The alloy surface to be anodized is treated with an aqueous solution of a mineral acid such as sulfuric acid (10 to 20%), nitric acid (10 to 30%) or phosphoric acid (40 to 80%) under the influence of a relatively low voltage direct current. This treatment suitably reduces the magnesium content of the surface layer and, subsequently, a relatively low current density anodization in sulfuric acid produces the clear coating. The clear coating may then be colored by known processes.

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Wernick et al., “Decorative and Proctective Anodizing”, The Surface Treatment and Finishing of Aluminum and Its Alloys, Chapter 7, p. 376, month unavailable, 1987.

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