晶界改性热变形(Nd,Ce)-Fe-B磁体耐腐蚀性能研究  

Research on corrosion resistance of hot-deformed(Nd,Ce)-Fe-B magnet by grain boundary modification

作　　者：崔熙贵[1] 赵志航 舒刚易 梁文接 黄欣 葛鑫 Cui Xigui;Zhao Zhihang;Shu Gangyi;Liang Wenjie;Huang Xin;Ge Xin(School of Mechanical Engineering,Jiangsu University,Jiangsu Zhenjiang,212013,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《机械设计与制造工程》2024年第12期112-116,共5页Machine Design and Manufacturing Engineering

基　　金：江苏省自然科学基金(BK20191432);镇江市重点研发计划(GY2020012);江苏高校青蓝工程;江苏大学第二十一批大学生科研立项(21B044)。

摘　　要：针对(Nd,Ce)-Fe-B磁体耐腐蚀性能差的问题,采用低熔点Y-Gd基合金对其进行晶界改性,结合微观形貌及元素成分分析,研究了不同比例Y-Gd基合金添加量下磁体在3.5wt%NaCl溶液中的电化学特性。结果表明:随着Y-Gd基合金添加比例的增加,磁体的开路电位升高,阻抗谱半径增大,同时腐蚀电位增加,腐蚀电流密度减小,在添加量为2wt%时,磁体的耐腐蚀性能最佳;与未添加Y-Gd基合金的磁体相比,Y-Gd基合金的添加提高了磁体晶界相的电极电位,降低了其与主相的电位差,而且磁体的进一步致密化减少了晶间腐蚀的通道,进而提升了磁体的耐腐蚀性能。Aiming at the poor corrosion resistance of(Nd,Ce)-Fe-B magnets,the low-melting point Y-Gd based alloy is used to modify the grain boundary,and the electrochemical characteristics of the magnets in 3.5wt%NaCl solution with different additions of Y-Gd based alloy are studied in combination with microscopic morphology and element composition analyses.The results show that with the increase of Y-Gd based alloy addition ratio,the open circuit potential of the magnet increases,the impedance spectrum radius increases,and the corrosion potential increases,and the corrosion current density decreases.When the addition amount is 2wt%,the corrosion resistance of the magnet is optimum.Compared with the non-added magnets,the addition of Y-Gd based alloy increases the electrode potential of the grain boundary phase of the magnets,reducing the potential difference between it and the main phase,and further densification of the magnets reduces the channel of intercrystalline corrosion,thus improves the corrosion resistance of the magnets.

关 键 词：热变形(Nd Ce)-Fe-B磁体 晶界改性 耐腐蚀性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]