Electrolytically treating anodized aluminum in sulfuric acid...

Details Electrolytically treating anodized aluminum in sulfuric acid... Electrolytically treating anodized aluminum in sulfuric acid...

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/14 (2006.01) C25D 11/22 (2006.01)

Patent

CA 1212351

ABSTRACT OF THE DISCLOSURE An electrolytic coloring process for anodised aluminum or aluminum alloy is disclosed in which the aluminum is subjected to electrolytic treatment, in the absence of metal salts, in a low dissolution electrolyte having a chemical activity equivalent to an H2SO4 concentration of less than 4gm/litre, by applying an alternating current having a peak voltage of between 55 and 85 volts and a current density of less than 0.3 amp/dm2 and then treating the aluminum in an acid electrolyte containing a metal salt, again using alternating current of the same peak voltage range.

394317

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