HYDROGEN INDUCED CORROSION MECHANISM IN NDFEB MAGNETS
HYDROGEN INDUCED CORROSION MECHANISM IN NDFEB MAGNETS
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DOI：
10.1063/1.361626
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发表时间：
1996-04
影响因子：
3.2
通讯作者：
A. Kim;F. Camp;T. Lizzi
中科院分区：
文献类型：
--
作者：
A. Kim;F. Camp;T. Lizzi
比较了NdFeB磁体在流动氢气中和高温高湿条件下的腐蚀行为。结果表明，两种环境下的腐蚀在宏观和微观上都是相似的。在这两种情况下，Nd2Fe14B基体颗粒的磁取向垂直于外表面的区域腐蚀最快。提出了一种腐蚀机理，涉及氢作为纯气体或水蒸气分解的副产物与富钕晶界相的反应。
An investigation was conducted comparing the corrosion behavior of NdFeB magnets in flowing hydrogen and in the heat and humidity of an autoclave. The results show that corrosion is both macroscopically and microscopically similar in both environments. In both cases, the corrosion progressed most rapidly in those areas where the magnetic orientation of the Nd2Fe14B matrix grains was perpendicular to the outer surface. A corrosion mechanism involving the reaction of hydrogen—either as a pure gas or as a by‐product of the decomposition of water vapor—with the neodymium‐rich grain boundary phase is proposed.