C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
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
de Miguel Lopez Isidoro
Gazapo Santa-Olalla Jose L.
Gonzalez Feliu Juan
Empresa Nacional Del Aluminio S.a.-Endasa
Marks & Clerk
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