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采用不同电沉积方式制备了不同结构和晶粒尺寸的纳米晶钴(Co)镀层.采用扫描电镜和X-射线衍射仪分别分析了镀层表面形貌、晶相结构与晶粒尺寸.采用MV-2T显微硬度计测试镀层的硬度.最后采用UMT-3M多功能摩擦磨损试验机对镀层的摩擦和磨损性能进行了评价,并用扫描电镜对其磨损表面进行了观察分析.结果表明:电沉积方式对制备的纳米Co镀层的晶相结构、晶粒尺寸、镀层形貌和摩擦磨损性能影响显著;采用双脉冲制备的纳米Co镀层具有最小的晶粒尺寸、最高的硬度及较好的耐磨性能;采用单双脉冲混合电镀制备的纳米Co镀层表面针孔孔洞直径最小,结构最致密,耐磨性能最好.这些研究结果说明可通过优化电沉积方式来提高镀层的结构致密性,改善其硬度和耐磨性能.
Nanocrystalline cobalt (Co) coatings with different structures and grain sizes were prepared by different electrodeposition methods.The surface morphology, crystal phase structure and grain size of the coatings were analyzed by scanning electron microscopy and X-ray diffractometer.Using MV- 2T microhardness tester was used to test the hardness of the coating.Finally, the friction and wear properties of the coating were evaluated by UMT-3M multi-purpose friction and wear tester and the wear surface was observed and analyzed by scanning electron microscopy.The results show that the electrodeposition method The crystal phase structure, grain size, morphology and friction and wear properties of the prepared nano-Co coating are significantly affected. The nano-Co coating prepared by double pulse has the smallest grain size, the highest hardness and the better wear resistance The pinholes on the surface of nano-Co coating prepared by single-pulse hybrid plating have the smallest diameter, the most compact structure and the best wear resistance.These results show that the structure densification of the coating can be improved and the hardness can be improved by optimizing the electrodeposition method And wear resistance.