C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.6
C25D 11/22 (2006.01)
Patent
CA 1155080
COATING SYSTEM Abstract of the Disclosure 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 .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 polycarboxylic 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 asymmetry to said electrodes.
332919
Marcoux & Sher Swabey Mitchell Houle
Reynolds Metals Company
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