目的 研究不同喷涂距离下WC-10Co-4Cr涂层的摩擦腐蚀性能，探究其机理并优化工艺参数，以提高涂层性能。方法 通过超音速火焰喷涂技术在304不锈钢基体上制备WC-10Co-4Cr防护涂层，通过扫描电子显微镜和X射线衍射仪研究涂层的微观结构及相组成，采用维氏显微硬度计测量涂层的显微硬度。采用装配有电化学工作站的摩擦磨损测试仪，对浸没于3.5%NaCl盐溶液中的涂层进行摩擦腐蚀实验，测量涂层在静态及滑动条件下的磨损率、摩擦系数和极化曲线。结果 喷涂距离提高时，涂层孔隙率降低，硬度提高，达到1100~1400 HV。在腐蚀介质中滑动摩擦时，WC-10Co-4Cr涂层的磨损率较304不锈钢低2个数量级，磨损率为1.7×10-7 mm3/(N?m)，而304不锈钢的磨损率为2.6×10-5 mm3/(N?m)。结论 WC-10Co-4Cr涂层良好的摩擦腐蚀性能归因于承受负载的WC相与产生钝化的金属粘结相之间的协同作用，其抵抗涂层受摩擦腐蚀破坏。

The work aims to study the tribocorrosion behaviors of the coatings sprayed under different spraying distances and improve coating properties by investigating its mechanism and optimizing the process parameters. WC-10Co-4Cr coatings were prepared on 304 stainless steel substrates by high velocity oxygen-fuel (HVOF) spraying technology. Microstructure and phase composition of the coatings were studied by scanning electron microscope (SEM) and X-ray diffractometer (XRD), and microhardness was measured by Vickers hardness tester. Tribocorrosion test was carried out on the coatings immersed in 3.5%NaCl aqueous solution by a reciprocation tribometer integrated with a potentiostat for electrochemical control to measure the wear rate, friction coefficient and polarization curve of the coating under static and sliding conditions. With the increase of the spray distance, the porosity of the coating decreased, but the hardness of the coatings increased, reaching 1100~1400 HV. The wear rate of the WC-10Co-4Cr coatings was lower than that of the 304 stainless steel by more than two orders of magnitudes when being subjected to sliding in the corrosive medium. The wear rate of the former was 1.7×10-7 mm3/(N?m), while that of the latter was 2.6×10-5 mm3/(N?m). The excellent tribocorrosion behaviors of WC-10Co-4Cr coatings are ascribable to synergistic actions of the load-bearing WC phase and the passive metal binder, which can resist the damage caused by tribocorrosion.