Cavitation erosion-corrosion characteristics of HVOF sprayed Fe-Cr-Ni-C-Si coating for Cu alloy

Materials exposed to a marine environment are damaged in a number of ways, such as through cavitation, erosion, abrasion, corrosion, and a combination thereof. Organic coating or surface coating using a metallic material is a technique that is used to improve the durability of a product exposed to a marine environment. This study aims to improve the cavitation resistance by applying a high velocity oxygen fuel (HVOF) spray coating technique using Fe-Cr-Ni-C-Si powder to ALBC3 alloy, which is used under a marine environment. After the cavitation test was conducted, the cavitation rate of the coating layer was found to be great in the initial stage and then, it was constant. For the case of the Fe-Cr-Ni-C-Si coating layer, the solid solution, which was reacted with interstitial elements of C and Si, was evenly distributed and, thus, it shows an excellent cavitation resistance.