Method of forming coloured anodized coating on die-cast...

Details Method of forming coloured anodized coating on die-cast... Method of forming coloured anodized coating on die-cast...

C - Chemistry, Metallurgy

25

D

204/24.8

C25D 11/14 (2006.01) C25D 11/06 (2006.01)

Patent

CA 1193572

ABSTRACT A method of chemically forming and colouring an anodized coating on die-cast Al alloys, the chemical formation and colouration of the anodized coating being performed simultaneously by applying to the alloy an alternating current the polarity of which is reversed to be negative for less than 14% of each cycle, in an electrolyte containing either inorganic or organic acid. The method also enables the chemically formed and coloured anodized coating to be variously coloured and further improved by dipping the coated object into a heated metallic salt solution or water.

388962

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