Effect of Electrolysis Condition on Internal Stress and Hardness of Ni-W Electrodeposits

Abstract

Chromium plating has widely used as a surface treatment method, which has high wear resistance, hardness, and corrosion resistance. There are restrictions on the hard chromium plating to cause environmental pollution. The need to develop a wet plating method to replace this situation is being raised. Ni-W alloy plating has been reported to exhibit high hardness, wear resistance, excellent corrosion resistance and high-temperature stability, such as catching a Chrome plating by a wet plating method to replace. For the precipitation mechanism and the plating solution of this Ni-W alloy plating research, it has long been carried out by many researchers. Ni-W alloy plating has recognized as Induced Co-deposition alloy. It reported that Ni-W alloy plating is amorphous and shows a tendency to decrease of the crystal grains as the W content is increased in the coating layer, the hardness increases due to the decrease of the crystal. In this study, mechanical property of Ni-W electrodeposits in various manufacturing condition such as temperature and current density was investigated to understand the effect of electrolysis temperature and current density on internal stress and Hardness. The overvoltage strength and thermal strength explained the results.