Process for coloring, by electrolysis, an anodized aluminum or a

Details Process for coloring, by electrolysis, an anodized aluminum or a Process for coloring, by electrolysis, an anodized aluminum or a

1975-08-28

1976-08-31

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1122

Patent

active

039779483

ABSTRACT:
A process for coloring an aluminum or aluminum alloy piece previously subjected to anodic oxidation, in which codeposition of at least one metal selected from the group consisting of nickel, cobalt, and cadmium with at least one auxiliary metal is carried out by stirring, and applying an alternating voltage between such piece and a counterelectrode immersed in a bath containing the salts of the mentioned metals. The alternating voltage, for each period, has a zero value for at least a certain period of time, and the bath has a pH below or equal to 1.8 and contains at least one auxiliary metal salt selected from the group consisting of copper and tin salts. The concentration of the auxiliary metal salt in the bath is lower than 2.5 g/l and the concentration in the bath of the salt selected from the Ni, Co and Cd salt is preferably lower than 200 g/l.

REFERENCES:
patent: 3669856 (1972-06-01), Gedde
patent: 3787295 (1974-01-01), Endinger et al.
patent: 3892636 (1975-07-01), Kaneda et al.
patent: 3929593 (1975-12-01), Sugiyama et al.

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