50 microns. The thickness of Co-Ni-Fe-P alloy coating is 50 microns. Alloy electroplating is a process of plating a thin layer of alloy on the surface of some metals by using electrolysis principle to obtain better material properties. It is a process of attaching a metal film on the surface of metal or other materials by electrolysis to prevent metal oxidation (such as corrosion) and improve wear resistance, conductivity, reflectivity and corrosion resistance.