Method for producing full color images on aluminum

Chemistry: electrical and wave energy – Processes and products

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8471, 204 181, 204 38A, C25D 1118

Patent

active

044513356

ABSTRACT:
A process for the production of full color, partial colored or two colored pictures, scenes, words, etc., on articles of aluminum or aluminum alloys. The process involves first forming a hard, dense, non-colored anodic coating of between about 0.4 mils and 1.0 mils on 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; and coloring the coating by intimately contacting the unsealed coating with a paper containing a dye or dyes capable of subliming and then heating the surfaces causing the dye to sublime and transfer to the unsealed anodic film.

REFERENCES:
patent: 3484342 (1969-12-01), Blake et al.
patent: 3524799 (1970-08-01), Dale
patent: 4180443 (1979-12-01), Darrow
patent: 4201821 (1980-05-01), Fromson et al.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp. 455-458, 474-475.

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