工艺参数对电镀镍钴合金及其性能的影响  

Effect of Process Parameters on Electrodepositing Ni-Co Alloy and Its Properties

作　　者：杨航城 田海燕[1] YANG Hangcheng;TIAN Haiyan(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《电镀与精饰》2021年第4期5-10,共6页Plating & Finishing

摘　　要：在氨基磺酸盐镀液体系中,采用电沉积法制备Ni-Co合金镀层,采用SEM、XRD与维氏硬度仪分析镀层相结构、微观形貌及显微硬度,并研究了沉积电流密度、氨基磺酸钴浓度及电镀液温度对镀层微观结构与显微硬度的影响。结果表明:阴极电流密度对镀层的择优取向无显著影响,但对各衍射峰强度影响较大。氨基磺酸钴浓度对择优取向有明显影响,当浓度从6 g/L提高至18 g/L时,择优取向由双择优取向(111)与(220)转至单择优取向(111),且金属晶粒更为细化。钴盐浓度提升还有利于提高镀层的显微硬度,钴盐浓度为18 g/L时比浓度为6 g/L时的显微硬度提高约44.56%。溶液温度35~45℃,电流密度2 A/dm2时,可获得具有良好的表面质量与显微硬度合金镀层。Ni-Co alloy coating was electrodeposited on the surface of the stainless steel 304 in the sulfamate plating system.The phase structure,microstructure and microhardness of the coating were analyzed by SEM,XRD and vickers hardness tester.The effects of deposition current density,cobalt sulfamate concentration and electrodepositing temperature on the microstructure and microhardness of the coating were investigated.The results show that the cathode current density had no significant effect on the phase structure of the coating,but a great influence on the peak strength.The concentration of cobalt sulfamate had a significant effect on the preferred orientation,which was changed from double preferred orientations(111)and(220)to a single preferred orientation(111)with the concentration increased from 6 g/L to 18 g/L.In addition,the metal grains became refined with the concentration increased.Increasing the concentration of cobalt salt was also conducive to improve the microhardness of the coating,which was increased by about 44.56%when the cobalt salt concentration increased from 6 g/L to 18 g/L.The alloy coating with good surface quality and microhardness could obtain when the solution temperature of 35~45°C and deposition current density of 2 A/dm2.

关 键 词：电镀 镍钴合金 显微硬度 微观结构 工艺参数 

分 类 号：TQ153.2[化学工程—电化学工业]