Electrolytic coloring of anodized aluminum

Details Electrolytic coloring of anodized aluminum Electrolytic coloring of anodized aluminum

1976-04-20

1977-05-10

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

254 35N, C25D 1112, C25D 1122

Patent

active

040226719

ABSTRACT:
In the process of electrocoloring aluminum by passage of alternating current between anodized aluminum and a counter-electrode while immersed in a bath containing a salt of one or more of the group nickel, cobalt, tin, the range of colors obtainable by the process is extended by subjecting aluminum, which has been anodized under conventional D.C. conditions while immersed in a sulfuric acid-based electrolyte, to an electrolytic treatment in a phosphoric acid based electrolyte before the electrocoloring operation.

REFERENCES:
patent: 3382160 (1968-05-01), Asada
patent: 3844908 (1974-10-01), Matsuo et al.

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