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A comparative study on the corrosion behavior of NdFeB magnets in different electrolyte solutions

✍ Scribed by Y. W. Song; H. Zhang; H. X. Yang; Z. L. Song

Publisher
John Wiley and Sons
Year
2008
Tongue
German
Weight
671 KB
Volume
59
Category
Article
ISSN
0947-5117

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✦ Synopsis

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 hydroxide (NaOH), sodium chloride (NaCl), nitric acid (HNO~3~), and oxalic acid (H~2~C~2~O~4~) solutions was investigated by immersion and electrochemical tests. HNO~3~is the strongest corrosive electrolyte compared with the other three solutions. The increase in HNO~3~concentration can accelerate the corrosion of NdFeB magnets. NaCl belongs to medium corrosion electrolyte. A NaCl concentration of 0.5 M shows the severest corrosive feature in comparison with other concentrations of NaCl solution. NdFeB hardly suffers corrosion in NaOH and H~2~C~2~O~4~solutions owing to the formation of passivation films on the surface of magnets. Based on the corrosion behavior of NdFeB in different electrolytes, the possible corrosion mechanisms are discussed.

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