摘要
用电沉积方法在316L不锈钢表面制备了纯镍镀层和纳米SiC/Ni复合镀层,考察了电镀时间、SiC质量浓度、电流密度和镀液温度对复合镀层中纳米SiC含量的影响,表征了镀层的表面形貌和SiC纳米颗粒的尺寸;最后研究了镀层的摩擦磨损性能。结果表明:复合镀层中纳米SiC的含量随着电镀时间延长、电流密度增大、镀液温度升高以及SiC质量浓度的增大先升高后降低,且最佳工艺参数为电镀时间30min,SiC质量浓度20g·L-1,电流密度2A·dm-2,镀液温度60℃,镀液pH4.5,搅拌速度300r·min-1;与纯镍镀层相比,纳米SiC/Ni复合镀层的晶粒更细小,组织更致密,具有更好的摩擦磨损性能,摩擦因数降低了7%以上,磨损率降低了50%。
Pure nickel coating and SiC/Ni nano-composite coatings were prepared on 316L stainless steel surface by electro-deposition method.The influences of plating time,SiC mass concentration,current density and temperature of plating bath on the SiC content in the composite coatings were studied.The surface morphology of the coatings and the size of SiC nano-particulates were characterized.The friction and wear properties of the the coatings were investigated.The results show that SiC contents in the composite coating first increased and then decreased with increasing the plating time,current density,SiC concentration and temperature of the plating bath;and the optimal technological parameters were as follows:plating time of 30min,SiC concentration of 20g·L-1,current density of 2A·dm-2,bath temperature of 60℃,pH of 4.5,stirring rate of 300r·min-1.The grain size of SiC/Ni nano-composite coatings was smaller than that of the pure nickel coating.Comparing with the pure nickel coating,Ni-SiC nano-composite coatings had better friction and wear resistance,and its friction coefficient and wear rate were reduced by more than 7% and 50%,respectively.
出处
《机械工程材料》
CSCD
北大核心
2014年第7期53-57,62,共6页
Materials For Mechanical Engineering
基金
国家自然科学基金青年基金资助项目(51101080)
辽宁省高等学校杰出青年学者成长计划资助项目(LJQ2011115)
教育部留学回国人员科研启动基金资助项目(教外司留2012940号)
关键词
电沉积
纳米复合镀层
镍
纳米SIC
摩擦
磨损
electro-deposition
nano-composite coating
nickel
nano-SiC
friction
wear
