Process for electrolytically colouring aluminium and the...

C - Chemistry – Metallurgy – 25 – D

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204/24.6

C25D 11/08 (2006.01) C25D 11/22 (2006.01)

Patent

CA 1175775

ABSTRACT OF THE DISCLOSURE The present invention provides a process for electrolytically colouring aluminium and alloys thereof com- prising as a first step anodizing, as a second step colouring, and as a third step fixing, in which in the second colouring step, the ratio between the concentration of the acid used and the concentration of the colour-producing salt or salts is from 70:1 to 15:1, preferably from 40:1 to 20:1, the concentration of the sulphuric acid being above 15 g/l and the salts being metal sulphates, such as bismuth, cobalt, nickel, copper and tin, ideally in sulphate; in accordance with this concentration ratio, the peak voltage applied is of from 10 to 45 volts and the temperature is close to 25°C; and at the beginning of this second step the voltage is increased in a progressive and controlled manner.

375770

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