Coloured anodised finishes

Details Coloured anodised finishes Coloured anodised finishes

C - Chemistry, Metallurgy

25

D

204/21.5

C25D 11/24 (2006.01)

Patent

CA 1268445

A B S T R A C T Aluminium articles having porous anodic oxide films are given an exposure-resistant blue colouration by dipping them first in an aqueous solution of a phosphomolybdic acid or a silicomolybdic acid, and then in a solution of a strong reducing agent such as a stannous salt, and finally sealing the porous oxide film. The method is suitable for batch or continuous operation and useful to colour bumpers for passenger cars.

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