电流作用方式对纳米TiN/Ni复合镀层组织与力学性能的影响  

Influence of Current Mode on Microstructure and Mechanical Properties of Nano-TiN/Ni Composite Coatings

作　　者：何杰 吴蒙华[1] 李霖泰 HE Jie;WU Menghua;LI Lintai(School of Mechanical Engineering, Dalian University, Dalian 116622, China)

机构地区：[1]大连大学机械工程学院,大连116622

出　　处：《机械工程材料》2017年第11期33-38,共6页Materials For Mechanical Engineering

基　　金：辽宁省教育厅科学技术研究项目(L2015029);大连市科技计划项目(2015A11GX003)

摘　　要：采用添加了纳米TiN的氨基磺酸镍系镀液,利用超声电沉积方法在45钢基体上制备了纳米TiN/Ni复合镀层,对比研究了直流、单脉冲、正负脉冲等3种电流作用方式对镀层表面形貌、纳米TiN含量及分布、界面结合力、显微硬度和摩擦磨损性能的影响。结果表明:与直流电沉积相比,脉冲电沉积镀层的晶粒细小、表面平整、表面裂纹少、界面结合力高,且正负脉冲电沉积的界面结合力高于单脉冲电沉积的;脉冲电沉积更易沉积纳米TiN粒子,且正负脉冲电沉积TiN的沉积速率大于单脉冲的;正负脉冲电沉积镀层的显微硬度最高,摩擦磨损性能最佳,直流电沉积的最差。Nano TiN/Ni composite coatings were prepared on 45 steel substrate by the ultrasonicelectrodeposition method with a nickel sulfamate electroplating solution containing nano-TiN particles.The effects of the three current modes of direct current,single pulse and positive-negative pulse on surface morphology,nano-TiN content and distribution,interface binding force,microhardness and friction-wear performance of the coatings were compared and studied.The results show that compared to those by direct current electrodeposition,the grains of the pusle electrodeposited coating were finer,the surface was smoother,the surface cracks was fewer and the interface binding force was higher.The interface binding force of the positive-negative pulse electrodeposited coating was higher than that of single pulse electrodeposited coating.It was relatively easy for the pulse electrodeposition to deposite nano-TiN particles.The nano-TiN particle deposition rate by positive-negative pulse electrodeposition was higher than that by single pulse electrodeposition.The microhardness of the positive-negative pulse electrodeposited coating was the highest and its friction-wear performance was the best,while those of the direct current electrodeposition coating were the worst.

关 键 词：纳米TiN/Ni复合镀层 脉冲方式 显微组织 表面形貌 磨损性能 

分 类 号：TQ153.1[化学工程—电化学工业]