Process for electrolytic coloring of the anodic oxide film on al

Details Process for electrolytic coloring of the anodic oxide film on al Process for electrolytic coloring of the anodic oxide film on al

1975-08-27

1977-05-03

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 58, C25D 1106, C25D 1108

Patent

active

040213153

ABSTRACT:
In the process of coloring an anodized aluminum or aluminum alloy article by subjecting the anodized article to an electrolytic treatment with a direct current in an aqueous electrolytic coloring bath containing a water-soluble metallic salt, the oxide film on the article can be easily colored in a stable manner and in a uniform color, by subjecting the anodized article previously to an anodic direct current electrolysis in an aqueous solution containing the same metallic ion as in the coloring bath, and then to a cathodic direct current electrolysis for coloring the anodized oxide film on the article.

REFERENCES:
patent: 3878056 (1975-04-01), Yanagida et al.
patent: 3892636 (1975-07-01), Kaneda et al.
patent: 3929612 (1975-12-01), Yanagida et al.

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