COLOURING ANODIZED ALUMINIUM IN SALT SOLUTIONS OF NICKEL, COBALT AND COPPER

摘要

1355619 Colouring anodised aluminium SWISS ALUMINIUM Ltd 19 June 1972 [17 June 1971] 28545/72 Heading C7B Anodised Al or Al alloy (e.g. containing 1À5% Mg) is coloured bronze to black by electrolytic treatment using A. C. in a solution containing one or more Ni and/or Co salts, e.g. NiSO 4 with boric acid, and one or more Cu salts, e.g. CuSO 4 to provide a Cu content of 0À02 to 0À75 g/l.