Electrolytic colouring of anodised aluminum

Details Electrolytic colouring of anodised aluminum Electrolytic colouring of anodised aluminum

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/14 (2006.01)

Patent

CA 1060376

A B S T R A C T In the process of electrocolouring aluminum by passage of alternating current between anodised aluminum and a counter-electrode while immersed in a bath containing a salt of one or more of the group nickel, cobalt, tin, the range of colours obtainable by the process is extended by subjecting aluminum, which has been anodised under conventional D.C. conditions while immersed in a sulfuric acid-based electrolyte, to an electrolytic treatment in a phosphoric acid based electrolyte before the electrocolouring operation. -1-

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