Method for coloring aluminum

Details Method for coloring aluminum Method for coloring aluminum

1978-12-26

1979-12-25

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

204 38A, C25D 1122

Patent

active

041804430

ABSTRACT:
A novel process is disclosed for the production of colored coatings on articles of aluminum or aluminum alloys which are particularly adapted to be employed for architectural uses which involves first forming a hard, dense anodic coating on aluminum and aluminum base alloys by anodizing the aluminum in a specific electrolyte comprising sulfuric acid, a polyhydric alcohol of 3 to 6 carbon atoms and an organic carboxylic acid containing at least one reactive group in the alpha position in order to obtain a material having a film thickness of between about 0.6 to about 1.1 mils and thereafter electrolytically coloring said anodized aluminum by passing alternating current between said anodized aluminum and a counter-electrode in an aqueous bath containing acid and a metal salt.

REFERENCES:
patent: 3382160 (1968-05-01), Asada
patent: 3524799 (1970-08-01), Dale
patent: 3669856 (1972-06-01), Gedde
patent: 3704210 (1972-11-01), Patrie
patent: 3769180 (1973-10-01), Gedde
patent: 3849263 (1974-11-01), Gedde
patent: 4014758 (1977-03-01), Kawai

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