A MULTI-LAYERED COPPER, NICKEL AND CHROMIUM ELECTRO- PLATED STEEL SUBSTRATE WITH EXCELLENT ANTI-CORROSIVE PROPERTIES

摘要

A multi-steel substrate with improved corrosion resistance, characterized by coating consisting of copper (Cu), nickel (Ni) and cromium (cr), wherein the coating sequence comprising one bottom layer of cu; three intermediate layers of Ni; and one top layer of cr, wherein the coating appearances and the thicknesses of the coated layers exhibits cyanide Bright copper between 2-3?m for the bottom layer; bright chrome between 0.5 to 1.00?m for the top layer; and sulfer-free semi bright nickel between 3-7?m, high sulfer tri-nickel between 1-2km, and bright nickel between 3-7?m for the three intermediate layers respectively when viewed from top, and wherein the coating is applied on the substrate by electroplating process.