超声辅助电沉积制备镍–钴–纳米氧化铝复合镀层及其性能研究  

Preparation of nickel–cobalt–alumina nanocomposite coating by ultrasound-assisted electrodeposition and study on its properties

作　　者：金辉[1,2] 陈立佳[1] 王一雍[2] 周新宇[2] JIN Hui;CHEN Li-jia;WANG Yi-yong;ZHOU Xin-yu(School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《电镀与涂饰》2018年第19期865-869,共5页Electroplating & Finishing

基　　金：国家自然科学基金(51674141);辽宁省自然科学项目科技厅项目(201602401)

摘　　要：采用超声辅助电沉积法在紫铜上制备了Ni–Co–纳米Al_2O_3复合镀层。研究了镀液中Al_2O_3纳米粒子质量浓度、超声功率和电流密度对复合镀层显微硬度和耐蚀性的影响。通过X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)分析了镀层的相结构、微观形貌和元素组成。随着镀液中纳米Al_2O_3颗粒的质量浓度、超声波功率或电流密度的增大,Ni–Co–纳米Al_2O_3复合镀层的显微硬度均呈先增后减的变化趋势。随超声功率的增大,复合镀层的耐蚀性先改善后变差。最优的电沉积工艺参数为:Ni SO_4·6H_2O 300 g/L,Ni Cl_2·6H_2O 80 g/L,CoSO_4·7H_2O 3 g/L,H_3BO_3 30 g/L,十二烷基磺酸钠0.1 g/L,Al_2O_3纳米粒子10 g/L,pH 4.8,温度50°C,电流密度3 A/dm^2,超声功率240 W,时间2 h。在该工艺条件下所得复合镀层的显微硬度为382 HV,纳米Al_2O_3弥散分布于其中,表面均匀、致密。A Ni–Co–Al2O3 nanocomposite coating was electrodeposited on red copper surface with the assistance of ultrasound.The effects of mass concentration of nano-Al2O3 particles in electrolyte,ultrasound power,and current density on microhardness and corrosion resistance of the nanocomposite coating were studied.The phase structure,micromorphology,and elemental composition of the nanocomposite coating were analyzed using X-ray diffractometer(XRD),scanning electron microscope(SEM),and energy dispersive spectrometer(EDS),respectively.The microhardness of the nanocomposite coating was increased initially and then decreased with the increasing of mass concentration of nano-Al2O3 particles in electrolyte,ultrasound power or current density.The corrosion resistance of the nanocomposite coating became better initially and then worse with the increasing of ultrasound power.The optimal process parameters of electrodeposition are:NiSO4·6H2O 300 g/L,NiCl2·6H2O 80 g/L,CoSO4·7H2O 3 g/L,H3BO3 30 g/L,sodium dodecyl sulfonate 0.1 g/L,nano-Al2O3 particles 10 g/L,pH 4.8,temperature 50°C,current density 3 A/dm^2,ultrasound power 240 W,and time 2 h.The microhardness of the nanocomposite coating obtained under the optimal conditions has a microhardness of 382 HV,and is uniform and compact with well-distributed nano-Al2O3 particles in it.

关 键 词：镍–钴合金 氧化铝 纳米颗粒 复合镀层 电沉积 超声辅助 耐蚀性 显微硬度 

分 类 号：TQ153.2[化学工程—电化学工业]