Color anodizing of aluminum

Details Color anodizing of aluminum Color anodizing of aluminum

1976-10-21

1977-11-29

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1114

Patent

active

040604624

ABSTRACT:
A process for producing a colored coating on aluminum comprises anodizing the aluminum at a voltage in the range of 6 to 24 volts in a sulfuric acid electrolyte and thereafter reducing the voltage to not greater than 3 volts while further anodizing the aluminum in the aforementioned electrolyte thereby producing the colored coating.

REFERENCES:
patent: 3227639 (1966-01-01), Kampert
patent: 3935084 (1976-01-01), Terai et al.
"The Surface Treatment & Finishing of Al", by S. Wernick et al., 3rd Ed., 1964, pp. 298-303, 306.

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