(1. 揚州大學水利與能源動力工程學院，揚州225127；
2. 揚州大學機械工程學院，揚州225127)
摘 要: 通過電鍍法制備Ni-Co-Mn三元合金并進行工藝優(yōu)化，同時制備Ni-Co-Mn-金剛石復合鍍層，采用硬度、納米劃痕、SEM、EDS、摩擦磨損等分析鍍層性能。結果表明：Ni-Co-Mn三元合金電鍍最佳主鹽配方為NiSO4280 g/L、CoSO411 g/L、MnSO41 g/L；鍍液溫度低于50 ℃時鍍層易“燒焦”，高于60 ℃時，鍍層硬度及結合力下降；當電流密度增大至3 A/dm2時，有利于形成平整致密的鍍層；當電流密度超過5 A/dm2時，鍍層表面易出現(xiàn)析氫、積瘤等缺陷；最佳電鍍工藝條件下的鍍層硬度達520.7 HV，膜基結合力達25.52 N；Mn含量越高，鍍層硬度越大；Co含量越高，鍍層與基體結合越好；Ni-Co-Mn-金剛石復合鍍層的硬度達890.2 HV，摩擦因數(shù)為0.72，體積磨損率僅為5.46×10-6 mm3/(N·m)，金剛石與胎體Ni-Co-Mn合金結合牢固，復合鍍層的磨削性好，耐磨性強。
關鍵字: Ni-Co-Mn合金；電鍍；復合鍍；納米劃痕；摩擦；磨損
（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
