Method of producing colour-anodized aluminium articles

Details Method of producing colour-anodized aluminium articles Method of producing colour-anodized aluminium articles

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/22 (2006.01)

Patent

CA 1153980

A METHOD OF PRODUCING COLOUR ANODIZED ALUMINIUM ARTICLES Abstract of the Disclosure The invention relates to a method of producing colour- anodized aluminium or aluminium alloy articles. This comprises forming an anodic oxide film on the surface of the article, subjecting the anodized article to a preliminary electrolytic treatment to reinforce the barrier layer of the anodic oxide film, and subsequently colouring the article by electrolysis in a system wherein the article works as the cathode and the electrolytic bath contains a metal salt, by passing between the cathode and a counter electrode of the system a direct current having superimposed thereon pulses with a positive voltage. In this way, deep colouring of the oxide film can be obtained.

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