Patent ID: 6383661
Filing Date: 2002-05-07
Classification: B23K,B32B,C25D,E04C,Y10S,Y10T

Abstract:
A method of manufacturing an Al or Al alloy workpiece comprising the steps of(a) providing an Al or Al alloy workpiece, (b) pre-treating the outersurface of the Al or Al alloy workpiece, and (c) plating a metal layer comprising nickel onto said outersurface of the Al or Al alloy workpiece, wherein during step (c) said metal layer comprising nickel is deposited by plating both nickel and bismuth using an aqueous bath having a pH in the range of 2.5 to 10, and comprising a nickel-ion concentration in a range of 10 to 100 g/l, a bismuth-ion concentration in the range of 0.01 to 10 g/l, a citrate-ion concentration in the range of 40 to 150 g/l, a gluconate-ion concentration in the range of 2 to 80 g/l, a chloride- or fluoride-ion concentration in the range of 1 to 50 g/l.