Patent ID: 8152985
Filing Date: 2012-04-10
Classification: C23C,C25D

Abstract:
1. A method of chrome plating a magnesium or magnesium alloy part, the method comprising the steps of: (a) treating the part with a fluoridating agent to develop a fluoridated surface layer including magnesium fluoride; (b) using electroless nickel plating to apply a nickel-phosphorous alloy layer across at least a portion of the fluoridated surface layer; (c) applying a copper coating at a position above the nickel-phosphorous alloy layer using a series of copper electrodeposition treatments, wherein said series of copper electrodeposition treatments includes at least one copper electrodeposition treatment using a cyanide solution, at least one copper electrodeposition treatment using a pyrophosphate solution of basic pH and at least one copper electrodeposition treatment using an acid solution; (d) electrodepositing a semi-bright nickel layer at a position above the copper coating; (e) electrodepositing a bright nickel layer at a position above the semi-bright nickel; (f) electrodepositing a layer of micro-porous nickel at a position above the bright nickel; and (g) electrodepositing a chromium layer at a position above the micro-porous nickel.