Microstructure and properties of Ni-W and Ni-W-SiC alloy coatings deposited by electroplating
Ni-W and Ni-W-SiC alloy platings were prepared on steel substrate by alloy electrodeposi-tion method. The chemical compositions, microstructure, vickers hardness, bonding strength, wear re-sistance and corrosion resistance of the coatings were tested and analyzed. The results show that the coatings as received are noncrystal, but most would crystallize after heat treatment at 500 ℃ for 2 h. The vickers hardness of Ni-W and Ni-W-SiC coatings can up to 1036 HV and 1136 HV, respectively. The vickers hardness and wear resistance of Ni-W and Ni-W-SiC coatings are obviously better than that of Cr coating. By neutral salt spray tests, the coatings shows good corrosion resistance. Their protection rating can be level 10.
万方数据
维普
