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Study on the corrosion behavior of NdFeB permanent magnets in nitric acid and oxalic acid solutions with electrochemical techniques

✍ Scribed by H. Zhang; Z. L. Song; S. D. Mao; H. X. Yang

Publisher: John Wiley and Sons
Year: 2009
Tongue: German
Weight: 593 KB
Volume: 62
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.200905498

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✦ Synopsis

Abstract

Corrosion behavior of sintered NdFeB magnets in nitric acid and oxalic acid was investigated. The experiment results indicated that NdFeB is strongly corroded in nitric acid solution, and is passivated in oxalic acid solution. Based on the corrosion behavior, the possible corrosion mechanisms are discussed.

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## Abstract Sintered NdFeB magnets possess excellent magnetic properties. However, the corrosion resistance property of NdFeB is very poor due to its multiphase microstructure consisting of matrix phase Nd~2~Fe~14~B, Nd‐rich phase, and B‐rich phase. The corrosion behavior of NdFeB magnets in sodium