Colored, anodized aluminum-base article and method of preparing

Details Colored, anodized aluminum-base article and method of preparing Colored, anodized aluminum-base article and method of preparing

1985-05-20

1986-08-19

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 58, 204 376, C25D 500

Patent

active

046067965

ABSTRACT:
A colored, anodized aluminum-base article including an aluminum-base substrate, and first and second anodized aluminum oxide films overlaid thereon. The inner, second film has a hardness of about 330 Hv or more, while the outer, first film is more porous than the second film and has a hardness of about 270 Hv or less. The first film is colored with a coloring agent. The article is prepared by anodizing an aluminum-base substrate in an electrolyte bath at a temperature of 20.degree.-40.degree. C. and, subsequently at a temperature not higher than 10.degree. C., the resultant substrate having two types of anodic aluminum oxide films formed thereon being subjected to a coloring treatment.

REFERENCES:
patent: 1965683 (1934-07-01), Work
patent: 2052575 (1936-09-01), Lilienfeld
patent: 2888388 (1959-05-01), Stiller
patent: 2905600 (1959-09-01), Franklin
patent: 3058855 (1962-10-01), Kirby et al.
patent: 3666638 (1972-05-01), Harris et al.

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