(1. 扬州大学水利与能源动力工程学院，扬州225127；
2. 扬州大学机械工程学院，扬州225127)
摘 要: 通过电镀法制备Ni-Co-Mn三元合金并进行工艺优化，同时制备Ni-Co-Mn-金刚石复合镀层，采用硬度、纳米划痕、SEM、EDS、摩擦磨损等分析镀层性能。结果表明：Ni-Co-Mn三元合金电镀最佳主盐配方为NiSO4280 g/L、CoSO411 g/L、MnSO41 g/L；镀液温度低于50 ℃时镀层易“烧焦”，高于60 ℃时，镀层硬度及结合力下降；当电流密度增大至3 A/dm2时，有利于形成平整致密的镀层；当电流密度超过5 A/dm2时，镀层表面易出现析氢、积瘤等缺陷；最佳电镀工艺条件下的镀层硬度达520.7 HV，膜基结合力达25.52 N；Mn含量越高，镀层硬度越大；Co含量越高，镀层与基体结合越好；Ni-Co-Mn-金刚石复合镀层的硬度达890.2 HV，摩擦因数为0.72，体积磨损率仅为5.46×10-6 mm3/(N·m)，金刚石与胎体Ni-Co-Mn合金结合牢固，复合镀层的磨削性好，耐磨性强。
关键字: Ni-Co-Mn合金；电镀；复合镀；纳米划痕；摩擦；磨损
（1. School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China;
2. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China）
Abstract:The Ni-Co-Mn ternary alloy samples were made by electroplating, and the process was optimized. While, the Ni-Co-Mn-diamond composite electroplating was prepared. The plating properties were detected by Vickers, scratch tester, SEM, EDS and friction wear testing machine. The results show that the optimumformula of main salt for Ni-Co-Mn alloy electroplating is NiSO4of 280 g/L, CoSO4 of11 g/L, MnSO4 of1 g/L. The alloy coating is easily burnt when the temperature is below 50 ℃, then hardness and binding force will decrease when it is over 60 ℃. An increase of current density to 3 A/dm2 can make the coating smooth and dense, the hydrogen evolution, deposition nodules and other defects will be produced when current density is over 5 A/dm2. The hardness of the optimized coating alloy reaches 520.7 HV, and the binding force is 25.52 N. The higher content of manganese element, the greater hardness of the coating.The higher content of cobalt element, the stronger binding force of the coating. The hardness of Ni-Co-Mn-diamond composite electroplating is 890.2 HV, its friction coefficient is 0.72, and its volume wear rate is only 5.46×10-6 mm3/(N·m). The holding force of diamonds in Ni-Co-Mn matrix alloy ishigh, the grind ability and abrasion performance of composite electroplating are also good.
Key words: Ni-Co-Mn alloy; electroplating; composite plating; nano-scratch; friction; wear
