Process for the electrolytic colouring of anodized aluminium

Details Process for the electrolytic colouring of anodized aluminium Process for the electrolytic colouring of anodized aluminium

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/06 (2006.01)

Patent

CA 1142477

ABSTRACT OF THE DISCLOSURE The invention provides a process for the electrolytic colouring of anodized aluminium, characterized in that in the first step thereof an aluminium oxide layer is produced on the metal using a sulphuric acid bath which has a concentration of from 150 to 200 g/l, a voltage between electrodes of from 12 to 20 volts, and a current density of from 1 to a A/dm2, the duration of this treatment being of from 15 to 60 minutes, while the second step of the process consisting introducing the metal into a colouring bath in which two different electrolytic steps are established, in the first of which the metal is subjected to a continuous pulsating voltage, while in the second a negative continuous pulsating voltage is programmed on the wave form of the first step.

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