The study of corrosion-wear mechanism of Ni-W-P alloy

The wear resistance of Ni-P alloys can be improved by the addition of W; however, it is not well understood how that addition will affect the corrosion-wear characteristics of the alloy. Therefore, a Ni-W-P alloy was prepared by electrodeposition and used for tribo-testing. The corrosion-wear behavior of the alloy, both in the as-prepared and heat-treated states, was investigated using a submerged ball on disk apparatus in deionized water and in 3.5 wt% NaCl solution. The ball material was Cr bearing steel. The 400 degrees C heat-treated Ni-W-P alloy had the minimum wear rate in both deionized water and 3.5 wt% NaCl solution. In the 3.5 wt% NaCl solution, the heat-treated alloy displayed pitting and abrasive wear. The Ni-W-P alloy as-prepared, showed uniform corrosion. Its main wear process was corrosive, and it showed adhesive wear when tested in the 3.5 wt% NaCl solution. In deionized water, the wear of the Ni-W-P alloy was caused by abrasion whether as-prepared or heat-treated. A synergy effect between wear and corrosion existed in Ni-W-P alloy, both in the as-prepared and heat-treated states when tested in a saline environment. (C) 2014 Elsevier B.V. All rights reserved.