Ni-Co-C代硬铬镀层的制备及性能研究(Ⅱ):镀层性能研究

Study on the Preparation and Properties of Ni-Co-C Coating as an Alternative to hard Chromium Coating (Ⅱ) :Properties of Ni-Co-C Coating

对比所开发的Ni-Co-C代硬铬镀层与商业镍、钴基代硬铬镀层的性能,探究其实际应用价值。由能谱分析及光电子能谱仪测试结果得知,镀层为镍、钴、碳三元合金,且三种元素在镀层中的存在价态均为零价,镍在镀层中主要以Ni和NiCo的形式存在,钴在镀层中主要以Co Ni的形式存在,碳在镀层中主要以C和C/Ni的形式存在,结合X-射线衍射仪测试结果知镀层为部分非晶态、部分金属间化合物的结构。在优化的Ni-Co-C基础镀液及工艺条件下得到的Ni-Co-C代硬铬镀层的硬度较大,在650~750 HV50之间,且Ni-Co-C代硬铬镀层的沉积速度要明显大于商用代硬铬镀层。

The properties and practical application value of investigated Ni-Co-C coating were evaluated by the performance comparison with commercial hard chromium coating alternatives based on Ni and Co coatings.The results of EDX and XPS showed that the coatings contained alloys of nickel,cobalt and car-bon,all of the elements were in form of zero valence.Ni and NiCo were the main existent forms of nickel,CoNi was the main existent form of cobalt,and carbon was composited by C and C/Ni in the coating.XPS and XRD showed that the crystallization of Ni-Co-C coatings were amorphous state and intermetallic com-pounds.Under the optimized conditions,the Vickers hardness of the coatings obtained in the optimized Ni-Co-C basic bath was stable from 650 to 750 HV50,and the deposition rate of the Ni-Co-C coating was greater than that of the commercial coating.