粘结NdFeB磁体腐蚀行为及机理研究  

Corrosion behavior and mechanism of bonded NdFeB magnets

作　　者：肖凯业[1] 许海 郑晓静[1] 郑文[1] 郭志伟 XIAO Kai-ye;XU Hai;ZHENG Xiao-jing;ZHENG Wen;GUO Zhi-wei(Institute of Physical and Chemical Engineering of Nuclear Industry,Tianjin 300180,China)

机构地区：[1]核工业理化工程研究院

出　　处：《粉末冶金工业》2018年第5期59-64,共6页Powder Metallurgy Industry

摘　　要：作为一种高磁能积永磁材料,粘结NdFeB磁体在航空航天、核工业、交通运输等多个领域得到广泛应用,其原材料是NdFeB快淬粉。由于NdFeB与空气接触极易发生腐蚀,为保证粘结NdFeB磁体的可靠性和寿命,针对防护处理后的带腐蚀损伤缺陷磁体的腐蚀行为进行研究,发现带有腐蚀损伤缺陷的磁体即使在经过可靠的防护处理后,在恶劣环境下腐蚀依然会继续扩展;不同损伤程度的磁体防护后的腐蚀快慢速度不同,随着腐蚀时间延长,先前的腐蚀产物Fe2O3与水反应生成H2,加速了损伤磁体的腐蚀。As a permanent magnet material with high magnetic energy product,bonded NdFeB magnets have been widely used in aerospace,nuclear industry,transportation and other fields. Its raw material is NdFeB rapid quenching powder. The NdFeB magnets are easy to corrode in air environment,in order to ensure the reliability and life of bonded NdFeB magnets,the corrosion behavior of magnets with corrosion defect after protective treatment was studied. It is found that the corrosion grows continually and the magnetic performance decreases even though the magnet has reliable coating protection. The corrosion rates of magnets with different damage degrees are different. With the increase of corrosion time,the previous corrosion product Fe2 O3 reacts with water to produce H2,accelerating the corrosion of damaged magnets.

关 键 词：NDFEB磁体 腐蚀损伤 涂层防护 腐蚀机理 

分 类 号：TG172[金属学及工艺—金属表面处理]