Colouring aluminium after anodization in electrolyte of...

Details Colouring aluminium after anodization in electrolyte of... Colouring aluminium after anodization in electrolyte of...

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/06 (2006.01)

Patent

CA 1148110

COATING SYSTEM Abstract of the Disclosure A novel process is disclosed for the production of colored coatings on articles of aluminum or alumi- num 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 .6 to about 1.1 mils and thereafter electro- lytically 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.

332918

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