WC-NiCr and WC-Hastelloy C coatings were deposited on Monel K-500 substrate by HVOF-spray with an aim to enhance cavitation erosion resistance of the alloy. The cavitation tests were performed for 10 h following ASTM G32-10 standard. Both WC-NiCr as well as WC-Hastelloy C coatings successfully reduced the erosion volume loss of the alloy by 59% and 9% respectively. The relatively superior performance of WC-NiCr coating could be attributed to better combination of its microhardness and fracture toughness. Formation of craters, cavities, and debonding of splats were found to be the signatures of cavitation erosion in the coatings. Whereas, microplastic tearing and microcracks were observed as the primary erosion mechanism in Monel K-500.

通过HVOF喷涂将WC-NiCr和WC-Hastelloy C涂层沉积在Monel K-500基底上，目的是增强合金的抗气蚀性。遵循ASTM G32-10标准进行了10小时的空化测试。WC-NiCr涂层和WC-Hastelloy C涂层均分别成功地将合金的腐蚀体积损失减少了59％和9％。WC-NiCr涂层的相对优越的性能可以归因于其显微硬度和断裂韧性的更好组合。发现凹坑的形成，空洞和碎片的脱粘是涂层中空化侵蚀的标志。而在Monel K-500中，微塑性撕裂和微裂纹是主要的腐蚀机理。