Method of coloring aluminum or aluminum alloy material

Details Method of coloring aluminum or aluminum alloy material Method of coloring aluminum or aluminum alloy material

1991-03-01

1992-06-09

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming nonelectrolytic coating after forming nonmetal...

2041812, C25D 544, C25D 1302, C25D 1124

Patent

active

051204053

ABSTRACT:
An aluminum or aluminum alloy material is subjected to anodic oxidation, then to a treatment of electrophoresis in a bath containing a hexacyanoferrate (II) or hexacyanoferrate (III), and subsequently to a treatment of immersion in a bath containing at least one metal salt selected from the group consisting of salts of Fe, Ni, Co, Cu, Zn, Cd, Ba, Tl, and Mg and at least one electrolyte selected from the group consisting of sodium sulfate, potassium sulfate, sodium chloride, and potassium chloride. Consequently, a coloring compound formed by the reaction of the aforementioned hexacyanoferrate (II) or hexacyanoferrate (III) with the aforementioned metal salt is deposited in the receding parts of micropores of an anodic oxide coating, with the result that the aluminum or aluminum alloy material is endowed with a durable color.

REFERENCES:
patent: 3031387 (1962-04-01), Deal
patent: 3143435 (1964-08-01), Kampert
patent: 3718548 (1973-02-01), Paulet et al.
patent: 3844908 (1974-10-01), Matsuo et al.
patent: 4659439 (1987-04-01), Watanabe et al.

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