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采用超音速火焰喷涂(HVOF)技术和电镀技术分别制备了纳米WC-10Co-4Cr涂层及电镀铬层,通过扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度计、摩擦磨损试验机、电化学工作站、磨损腐蚀加速试验机等手段对比分析了这两种涂层的性能以及使用寿命。结果表明,纳米WC复合涂层具有远高于电镀铬层的显微硬度、耐磨损性能及结合强度等,并且该涂层具有较高的致密度,而耐腐蚀性能略低于电镀铬层但也远高于基材,磨损腐蚀加速试验结果显示该涂层的使用寿命高达电镀铬层的5倍以上。
The nano-WC-10Co-4Cr coating and the electroplated chrome layer were prepared by HVOF and electroplating technology respectively. The wear resistance of the WC-10Co-4Cr coating was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester, Test machine, electrochemical workstation, wear corrosion accelerated test machine and other means of comparative analysis of the performance of both coatings and service life. The results show that the nano-WC composite coating has a much higher microhardness, wear resistance and bonding strength than the electrochromic chromium layer, and the coating has a higher density, while the corrosion resistance is slightly lower than that of the electrochromic layer But also much higher than that of the substrate. The results of wear accelerated corrosion test showed that the service life of the coating is more than 5 times of the electrochromic layer.