采用超声速等离子喷涂法在汽车活塞环用45钢表面制备了Ni60A-Cr₂O₃复合涂层，通过X射线衍射（XRD），扫描电镜（SEM），摩擦磨损试验，电化学试验和浸泡腐蚀试验研究了Cr₂O₃含量对Ni60A-Cr₂O₃复合涂层物相组成、显微组织、耐磨性能和耐腐蚀性能的影响。结果表明：Ni60A-Cr₂O₃复合涂层中除有增强相Cr₂O₃外，还含有FeNi₃、Fe（C，B）₆和Cr₂₃C₆等含Cr析出相；随着复合涂层中Cr₂O₃含量的增加，复合涂层的磨损量呈现先减小而后增加的趋势，在Cr₂O₃质量分数为35%时磨损量最小，Ni60A-Cr₂O₃复合涂层中适宜的Cr₂O₃添加量为35%；Ni60A涂层和35% Cr₂O₃+65% Ni60A复合涂层的磨损机制分别为黏着磨损和磨粒磨损；极化曲线测试结果和浸泡腐蚀试验结果都表明，在1.5 mol/L H₂SO₄和3.5% NaCl溶液中，35% Cr₂O₃+65% Ni60A复合涂层的耐腐蚀性能都要优于Ni60A涂层的。

The Ni60A-Cr₂O₃ composite coatings were prepared on surface of 45 steel for automobile piston ring by hypersonic plasma spraying. The effects of Cr₂O₃ content on the phase composition, microstructure, wear resistance and corrosion resistance of the Ni60A-Cr₂O₃ composite coatings were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), frication and wear testing, electrochemical testing and immersion corrosion testing. The results show that in addition to the enhanced phase Cr₂O₃, FeNi₃, Fe(C, B)₆, Cr₂₃C₆ and other Cr precipitates were formed in the Ni60A-Cr₂O₃ composite coatings. With the increase of Cr₂O₃ content in the composite coatings, the wear-loss of the composite coatings decreased first and then increased, and the minimum value of the wear-loss was obtained when the Cr₂O₃ mass fraction was 35%, and the suitable amount of Cr₂O₃ added to the Ni60A-Cr₂O₃ composite coatings was 35%. The wear mechanism of the Ni60A coating and the 35% Cr₂O₃ + 65% Ni60A composite coating were adhesive wear and abrasive wear, respectively. The test results of polarization curves and immersion corrosion test showed that the corrosion resistance of 35% Cr₂O₃ + 65% Ni60A composite was better than that of the Ni60A coating both in 1.5 mol/L H₂SO₄ solution and in 3.5% NaCl solution.