Cavitation erosion and corrosion-cavitation synergism behaviour of CoCrFeNiMnTi x high entropy alloy coatings prepared by laser cladding

Abstract

Cavitation erosion and corrosion-cavitation synergism behavior of CoCrFeNiMnTi _x (x = 0.5, 1.0, 1.5, 2.0 in atomic ratio) high entropy alloy coatings were analyzed. The sample with x = 1.0 showed the best cavitation erosion resistance due to the low weight loss and the maximum erosion rate. The protective ability of passivation film also displayed an increased first and then decreased tendency with the increase of Ti content as indicated by corrosion-cavitation synergism determined by open circuit potential method under cavitation erosion and quiescence condition. The sample with x = 1.0 displayed good re-passivation ability of passivation film according to open circuit potential behavior under cavitation erosion and quiescence condition. In general, the sample with x = 1.0 exhibited the highest cavitation erosion, the best self-repairing ability of the passivation film under the corrosion-cavitation synergism condition, which showed a great potential in the application of ocean engineering field as fluid-passing parts.