Effect of Microstructure on the Corrosion Resistance of Nd-Fe-B Permanent Magnets
Effect of Microstructure on the Corrosion Resistance of Nd-Fe-B Permanent Magnets
复制标题
微观结构对Nd-Fe-B永磁体耐腐蚀性能的影响
DOI：
10.4283/jmag.2011.16.3.304
复制
发表时间：
2011-09-01
影响因子：
0.5
通讯作者：
Zhu, Minggang
中科院分区：
文献类型：
--
作者：
Li, Jiajie;Li, Wei;Zhu, Minggang
烧结和热变形两种方法均可制备出高性能的NdFeB磁体。比较了两种工艺制备的磁体的腐蚀行为。研究了显微组织对NdFeB磁体耐蚀性的影响。对不同工艺的磁体进行了中性盐雾试验。测定了腐蚀试验后试件的失重率。用扫描电子显微镜观察了腐蚀组织。结果表明，热形变磁体的耐腐蚀性远好于烧结磁体，这是因为热形变磁体的晶粒度和富ND相的分布比烧结磁体细小和均匀。烧结磁体和热变形磁体的微观结构不同，导致了不同的腐蚀行为。
High performance Nd-Fe-B magnets can be manufactured by both sintering and hot deformation. The corrosion behaviors of the magnets prepared by the two processes were compared. Effect of microstructure on the corrosion resistance of Nd-Fe-B magnets was also investigated. A neutral salt spray test (NSS) was performed for the different-processed magnets. The weight losses of the samples after the corrosion test were measured. The corrosion microstructures were observed using a scanning electron microscope. It shows that the corrosion resistance of hot deformed magnets is much better than that of the sintered ones because the grain size and the distribution of Nd-rich phases of the hot deformed magnets are much finer and more uniform than those of the sintered ones. The different microstructure between the sintered and the hot deformed magnets causes the different corrosion behavior.