铝合金表面Ni-SiC-CaF_(2)复合镀层的组织和性能研究  

Microstructure and properties of Ni-SiC-CaF_(2)composite coatings on aluminum alloy surface

作　　者：杜丹丹 田晓东[1] 卢嘉成 Du Dandan;Tian Xiaodong;Lu Jiacheng(School of Materials Science and Engineering,Chang’an University,Xi’an 710064,Chin)

机构地区：[1]长安大学材料学院,陕西西安710064

出　　处：《电镀与精饰》2024年第10期16-20,共5页Plating & Finishing

摘　　要：在1060铝合金表面制备Ni-SiC-CaF_(2)复合镀层,用NiSO_(4)∙6H_(2)O、NiCl_(2)∙6H_(2)O、H_(3)BO_(3)和PVP配置镀液。在pH为4的条件下,研究施镀温度、电流密度和镀液中SiC浓度对Ni-SiC-CaF_(2)复合镀层组织的影响;通过扫描电子显微镜、X射线衍射仪、能谱仪、显微硬度计、摩擦磨损试验机等对镀层的表面、截面形貌、组织和性能进行检测与分析,同时对比纯Ni镀层、Ni-SiC、Ni-SiC-CaF_(2)复合镀层的摩擦磨损性能。结果表明:施镀温度为35~50℃,电流密度为5 A/dm^(2),镀液中添加SiC含量为60~80 g/L时,可形成组织稳定的含有8.26 at.%~8.95 at.%SiC和0.46 at.%~0.62 at.%CaF_(2)的复合镀层。相同工艺条件下,所制备的Ni-SiC-CaF_(2)复合镀层相较于纯Ni镀层和Ni-SiC复合镀层,摩擦系数分别降低了67.50%和35.00%,磨损速率分别降低了41.27%和26.14%。Ni-SiC-CaF_(2)composite coating was prepared on the surface of 1060 aluminum alloy with NiSO_(4)·6H_(2)O,NiCl_(2)·6H_(2)O,H_(3)BO_(3)and PVP as plating solution under the conditions of pH=4.The effects of plating temperature,current density and SiC concentration in plating solution on the microstructure of Ni-SiC-CaF_(2)composite coating were studied.The surface,cross section morphology,microstructure and properties of the coatings were detected and analyzed by scanning electron microscope,X-ray diffractometer,energy spectrometer,microhardness tester and friction and wear testing machine.Meanwhile,the friction and wear properties of pure Ni coating,Ni-SiC and Ni-SiC-CaF_(2)composite coating were compared.The results show that the stable composite coatings containing 8.26 at.%-8.95 at.%SiC and 0.46 at.%-0.62 at.%CaF_(2)can be formed when the plating temperature is 35-50,the℃current density is 5 A/dm^(2)and the content of SiC in the plating solution is 60-80 g/L.Under the same process conditions,the prepared Ni-SiC-CaF_(2)composite coating shows a 67.50%and 35.00%decrease in friction coefficient,and a 41.27%and 26.14%decrease in wear rate compared to pure Ni coating and Ni-SiC composite coating,respectively.

关 键 词：电镀 复合镀层 碳化硅 二氟化钙 

分 类 号：TQ153[化学工程—电化学工业]