连铸结晶器镍−钴−氧化铈复合镀液优化及镀层性能  

Optimization of bath composition for Ni-Co-CeO_(2)composite plating on continuous casting mold and properties of the coating

作　　者：朱榕 吴爽 陈博 刘玉龙 朱诚意 ZHU Rong;WU Shuang;CHEN Bo;LIU Yulong;ZHU Chengyi(The State Key Laboratory of Refractories and Metallurgy,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education.Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《电镀与涂饰》2023年第23期1-7,共7页Electroplating & Finishing

基　　金：武汉科技大学大学生创新创业训练计划项目(D202202171044595592)。

摘　　要：为改善连铸结晶器铜板表面镀层的性能,提高其使用寿命,向Ni-Co合金电镀液中添加平均粒径为20μm的CeO_(2)颗粒进行Ni-Co-CeO_(2)复合电镀。以镀层的显微硬度为指标,通过正交试验得到的较优配方为:NiSO_(4)·6H_(2)O 90 g/L,CoSO_(4)·7H_(2)O 18 g/L,C6H8O7·H_(2)O 110 g/L,CeO_(2)3 g/L。通过场发射扫描电镜(FE-SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对比了Ni-Co合金镀层和Ni-Co-CeO_(2)复合镀层的表面和截面形貌、成分及相结构,并通过电化学分析和摩擦磨损试验对比了它们的耐蚀性和耐磨性。结果表明,Ni-Co-CeO_(2)复合镀层的显微硬度为663 HV,微观表面呈粗糙的胞状结构,整体致密、无微裂纹,耐蚀性和耐磨性远优于Ni-Co合金镀层。Ni-Co-CeO_(2)composite plating was conducted on the surface of copper mold for continuous casting by adding some CeO_(2)particles with an average diameter of 20μm to a Ni-Co alloy plating bath to improve the performance and service life of the mold.The optimal bath composition determined by orthogonal test with microhardness of coating as the index is:NiSO_(4)·6H_(2)O 90 g/L,CoSO_(4)·7H_(2)O 18 g/L,C6H8O7·H_(2)O 110 g/L,and CeO_(2)3 g/L.The surface and cross-section morphologies,elemental compositions,and phase structures of Ni-Co alloy coating and Ni-Co-CeO_(2)composite coating were compared by field-emission scanning electron microscopy(FE-SEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD).The corrosion and wear resistance of the coatings were also compared by electrochemical analysis and friction and wear testing.The results showed that the Ni-Co-CeO_(2)composite coating had a microscopically rough and cellular surface,but was compact and free of micro-cracks macroscopically.It featured a microhardness of 663 HV,as well as much better corrosion and wear resistance than the Ni-Co alloy coating.

关 键 词：连铸结晶器 镍−钴合金 氧化铈 复合电镀 显微硬度 组织结构 耐蚀性 耐磨性 

分 类 号：TQ153.2[化学工程—电化学工业]