摘要
利用脉冲电沉积在304不锈钢上制备了Ni-Al_(2)O_(3)纳米复合镀层,通过正交试验法确定了最佳工艺参数为:硫酸镍280 g/L,氯化镍45g/L,硼酸40g/L,十二烷基硫酸钠0.1g/L,平均电流密度4A/dm^(2),占空比40%,脉冲频率600Hz,纳米Al_(2)O_(3)颗粒质量浓度5 g/L,温度45-55℃,pH 3-4,搅拌速率约220 r/min,电沉积时间60 min。用扫描电子显微镜分析镀层表面形貌,用能谱仪确定镀层中Al_(2)O_(3)含量,用显微硬度计测试镀层的显微硬度,用数码显微镜测量镀层的表面粗糙度,用电化学工作站分析镀层的耐蚀性。结果表明:与直流电沉积复合镀层相比,脉冲复合镀层晶粒尺寸较小、结合紧密,纳米Al_(2)O_(3)颗粒均匀分散,显微硬度和纳米Al_(2)O_(3)颗粒含量高,表面平整,耐蚀性好。
Ni-Al_(2)O_(3) nanocomposite coating was prepared by pulse electrodeposition on 304 stainless steel.The optimal process parameters were determined by orthogonal test as follows:nickel sulfate 280 g/L,nickel chloride 45 g/L,boric acid 40 g/L,sodium dodecyl sulfate 0.1 g/L,average current density 4 A/dm^(2),duty cycle 40%,pulse frequency 600 Hz,Al_(2)O_(3) nanoparticle dosage 5 g/L,temperature 45-55℃,pH 3-4,stirring rate about 220 r/min,and deposition time 60 min.The surface morphology,Al_(2)O_(3) content,microhardness,surface roughness,and corrosion resistance of the coating were examined by using scanning electron microscope,energy-dispersive spectrometer,microhardness meter,digital microscope,and electrochemical workstation,respectively.The results showed that the composite coating prepared by pulse electrodeposition featured a smoother surface with smaller grain size,more compact microstructure,more uniform dispersion and higher content of Al_(2)O_(3) nanoparticles,higher microhardness,and better corrosion resistance as compared with that prepared by direct-current electrodeposition.
作者
姜广粉
张海云
傅彦迪
龚西鹏
孟建兵
赵玉刚
林伟盛
韩新港
JIANG Guangfen;ZHANG Haiyun;FU Yandi;GONG Xipeng;MENG Jianbing;ZHAO Yugang;LIN Weisheng;HAN Xin’gang(School of Mechanical Engineering,Shandong University of Technology,Zibo 255049,China;Advanced Manufacturing Research Institute,Shandong University of Technology,Zibo 255049,China)
出处
《电镀与涂饰》
CAS
北大核心
2021年第14期1057-1061,共5页
Electroplating & Finishing
基金
国家自然科学基金(51875328)
山东省自然科学基金(ZR201807060394)。
关键词
脉冲电沉积
镍
氧化铝纳米颗粒
复合镀层
微观组织
显微硬度
耐蚀性
pulse electrodeposition
nickel
alumina nanoparticle
composite coating
microstructure
microhardness
corrosion resistance
