Method of forming colored oxide film on aluminum or aluminum all

Details Method of forming colored oxide film on aluminum or aluminum all Method of forming colored oxide film on aluminum or aluminum all

1974-03-20

1976-01-06

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1108, C25D 1114

Patent

active

039309665

ABSTRACT:
A method of forming a colored oxide film on the surface of an aluminum material is disclosed in which the aluminum material is subjected to an electrolytic treatment in an aqueous solution containing sulfuric acid to form an aluminum oxide film containing aluminous oxides and having lattice defects; sulfuric ions in the solution are caused to enter into the lattice defects of the oxide film; some or all of the sulfuric ions are reduced to form sulfur and sulfides; and the colored oxide film is formed using the sulfur and sulfides as coloring sources.

REFERENCES:
patent: 2930741 (1960-03-01), Burger et al.
patent: 2998358 (1961-08-01), Nakayama
patent: 3468772 (1969-09-01), Sheasby et al.
patent: 3669856 (1972-06-01), Gedde
patent: 3717555 (1973-02-01), Chakravarti et al.
patent: 3761362 (1973-09-01), Oida et al.
patent: 3790452 (1974-02-01), Anderson et al.
patent: 3798137 (1974-03-01), Kampert
Surface Treatment of Aluminum by Wernick et al., 3rd Ed., 1964, p. 337.
"Aluminum" by S. Wernick, et al., 3rd Ed., 1964, pp. 345-346.

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