Coating system method for coloring aluminum

Details Coating system method for coloring aluminum Coating system method for coloring aluminum

1979-01-02

1979-12-18

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

204 38A, C25D 1122

Patent

active

041793420

ABSTRACT:
A novel process is disclosed for the production of colored coatings on articles of aluminum or aluminum alloys. The process involves first forming a hard, dense anodic coating of between about 0.2 to about 1.1 mils on the aluminum or aluminum base alloys by anodizing the aluminum in an acidic aqueous electrolyte comprising sulfuric acid, a polyhydric alcohol of from 3 to 6 carbon atoms and an organic carboxylic acid containing at least one reactive group in the alpha-position coloring the coating by applying alternating current to an electrode system comprising the coating and a counterelectrode immersed in an acidic aqueous bath containing a metal salt while modulating the voltage externally of said electrode system so as to apply voltage with controlled assymmetry to said electrodes.

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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