铝表面Ni-SiC-WS2复合镀层的制备及其性能研究

Preparation and Performance Research of Ni-SiC-WS2 Composite Coatings on Aluminum Surface

为了探究SiC和WS_(2)微粒的共沉积对Ni镀层的组织结构、耐磨性与耐蚀性的影响,在1060铝表面制备纯Ni镀层、Ni-SiC和Ni-SiC-WS_(2)复合镀层,利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、显微硬度计、球盘磨损机以及电化学工作站对镀层的表面、截面形貌、相组成、元素含量、显微硬度进行检测与分析,对比了纯Ni镀层、Ni-SiC和Ni-SiC-WS_(2)复合镀层的耐磨与耐蚀性能。结果表明:Ni-SiC-WS_(2)复合镀层平整致密,镀层中SiC和WS_(2)的质量分数分别为7.05%和2.53%,这导致其镍晶粒尺寸比纯Ni镀层和Ni-SiC复合镀层分别减小63.39%和21.63%。Ni-SiC-WS_(2)复合镀层的显微硬度最高可达424.73 HV0.5 N,比纯Ni镀层和Ni-SiC复合镀层分别提高57.70%和20.46%;镀层中的WS_(2)微粒有良好的减摩作用,使得Ni-SiC-WS_(2)复合镀层的摩擦系数较Ni-SiC复合镀层进一步降低17.39%,且磨损率降低24.62%;Ni-SiC-WS_(2)复合镀层的自腐蚀电流密度最小,为4.68μA/cm^(2),相比于纯Ni镀层和Ni-SiC复合镀层分别减少53.85%和11.36%;Ni-SiC-WS_(2)复合镀层具有更高的阻抗值,为112361Ω·cm^(2),与Ni镀层和Ni-SiC复合镀层相比,Ni-SiC-WS_(2)复合镀层表现出更好的耐腐蚀性能。

In order to investigate the effects of co-deposition of SiC and WS_(2)particles on the microstructure,wear resistance and corrosion re-sistance of Ni coatings,the pure Ni coating,the Ni-SiC composite coating and Ni-SiC-WS_(2)composite coating were prepared on the surface of 1060 aluminum.Scanning electron microscopy(SEM),X-ray diffractometer(XRD),energy dispersive spectroscopy(EDS)and microhard-ness tester,friction and ball disc wear tester and electrochemical workstation were used to detect and analyze the surface and cross section mor-phology,phase composition,elemental contents and microhardness of the coatings,and the wear resistance and corrosion resistance of the pure Ni,Ni-SiC and Ni-SiC-WS_(2)composite coatings were compared.Results showed that the Ni-SiC-WS_(2)composite coating was flat and compact,with a mass fraction of 7.05%(mass fraction,the same below)and 2.53%for SiC and WS_(2),respectively.This resulted in the reduction of nickel grain size by 63.39%and 21.63%,compared with the pure Ni coating and the Ni-SiC composite coating,respectively.The microhard-ness of Ni-SiC-WS_(2)composite coating was up to 424.73 HV0.5 N,which was 57.70%and 20.46%higher than that of the pure Ni coating and the Ni-SiC composite coating,respectively.WS_(2)particles in the coating had good antifriction effect,which made the friction coefficient of the Ni-SiC-WS_(2)composite coating further reduced by 17.39%compared to Ni-SiC composite coating,and wear rate reduced by 24.62%.The self-corrosion current density of Ni-SiC-WS_(2)composite coating was the lowest,at 4.68μA/cm^(2),which was reduced by 53.85%and 11.36%,com-pared with the pure Ni coating and the Ni-SiC composite coating,respectively.The Ni-SiC-WS_(2)composite coating had higher impedance value of 112361Ω·cm^(2),which demonstrated better corrosion resistance than the Ni coating and the Ni-SiC composite coating.