WC-10Ni and WC-20Cr₃C₂–7Ni coatings were deposited successively using high-velocity oxygen-fuel (HVOF) spraying. The microstructures and mechanical properties of the coatings were evaluated by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), Vickers microhardness tester, and Ultra nanoindentation tester. The cavitation erosion behaviors of the coatings at different flow velocities were investigated by a rotating disk rig facility with bolt cavitator and circulating system. The results showed that the main phases in the WC-10Ni and WC-20Cr₃C₂–7Ni coatings were WC, W₂C, W, and WC, (W,Cr)₂C, respectively. Both coatings were dense and well bonded to the steel substrate. Despite higher porosity and elastic modulus (E) as well as slightly lower hardness (H), the WC-10Ni coating showed lower H/E, H³/E² and η values as well as cavitation erosion resistance at each flow velocity compared to the WC-20Cr₃C₂–7Ni coating. Both coatings exhibited an increase in the volume loss rates with increasing flow velocity, and the critical flow velocity of the WC-20Cr₃C₂–7Ni coating was in the region of 33.5 to 41.9 m·s⁻¹. The cavitation erosion failure mechanism of the WC-10Ni coatings was the brittle detachment of the WC particles, while cavitation pinholes, pits, cracks, craters, and massive exfoliation contributed to the evolution of the cavitation erosion processes of the WC-20Cr₃C₂–7Ni coating with the increase of the flow velocity.

WC-10Ni和WC-20Cr ₃ C ₂ –7Ni涂层是使用高速氧气-燃料（HVOF）喷涂连续沉积的。通过X射线衍射（XRD），场发射扫描电子显微镜（FESEM），能量色散X射线光谱仪（EDS），维氏显微硬度测试仪和超纳米压痕测试仪评估了涂层的微观结构和力学性能。通过带螺栓空化器和循环系统的转盘式钻机研究了不同流速下涂层的空化腐蚀行为。结果表明，WC-10Ni和WC-20Cr ₃ C ₂ –7Ni涂层的主要相为WC，W ₂ C，W和WC，（W，Cr）₂C分别。两种涂层都是致密的，并与钢基材良好粘合。尽管孔隙率和弹性模量（E）较高，硬度（H）稍低，但WC-10Ni涂层在每种流速下均显示出较低的H / E，H ³ / E ²和η值以及在每种流速下的抗气蚀性WC-20Cr ₃ C ₂ –7Ni涂层。两种涂层均显示出随流速增加而体积损失率的增加，并且WC-20Cr ₃ C ₂ –7Ni涂层的临界流速在33.5至41.9 m·s ^-1范围内。WC-10Ni涂层的空化腐蚀破坏机理是WC颗粒的脆性剥离，而空化针孔，凹坑，裂缝，弹坑和大量剥落促进了WC-20Cr ₃ C ₂的空化腐蚀过程的发展。–7Ni涂层随着流速的增加而增加。