钕铁硼表面脉冲电沉积Ni镀层工艺及性能研究  

Process and properties of Ni coating on NdFeB magnet by surface pulsed electrodeposition

作　　者：杨牧南 罗三根[2] 卢耀军 余黎明 YANG Munan;LUO Sangen;LU Yaojun;YU Liming(School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China;College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Guorui Scientific Innovation Rare Earth Functional Materials(Ganzhou)Co.,Ltd.,Ganzhou 341000,Jiangxi,China)

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]江西理工大学稀土学院,江西赣州341000 [3]国瑞科创稀土功能材料(赣州)有限公司,江西赣州341000

出　　处：《有色金属科学与工程》2025年第1期54-64,74,共12页Nonferrous Metals Science and Engineering

基　　金：国家“十四五”重点研发计划资助项目(2022YFB3505400)。

摘　　要：基于当前钕铁硼产业的发展需求以及其表面防护技术所面临的问题,引入脉冲电沉积技术,采用脉冲电沉积改善钕铁硼磁体表面耐蚀性,通过优化占空比、频率和电流密度等工艺,获得低缺陷率、高表面综合质量的Ni镀层。镀层腐蚀电位由-894.36 mV提升至-680.0 mV,腐蚀电流密度达3.5×10^(-6) A/cm^(2),有效降低了镀层腐蚀倾向和腐蚀速率。结合镀层表面形貌分析发现,占空比和频率调控可降低浓差极化,而电流密度调控则有利于镀层表面质量的提升。Based on the current development needs of NdFeB industry and the problems faced by surface protection technology,pulse electrodeposition technology was introduced in this paper to improve the surface corrosion resistance of NdFeB magnets.Ni coatings with low defect rates and high surface comprehensive quality were obtained by optimizing processes such as duty cycle,frequency and current density.The corrosion potential of the coating increases from−894.36 mV to -680.0 mV,and the corrosion current density reaches 3.5×10^(-6) A/cm^(2),which effectively reduces the corrosion tendency and corrosion rate of the coating.Combined with the analysis of the surface microstructure of the coating,it is found that the concentration polarization can be reduced by the regulation of duty ratio and frequency,while the regulation of current density can improve the surface quality of the coating.

关 键 词：钕铁硼磁体 脉冲电沉积 工艺参数 耐腐蚀性 

分 类 号：TG335.22[金属学及工艺—金属压力加工]