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

被引：56

作者：

Song, Y. W. ^{[1
]}

Zhang, H. ^{[1
]}

Yang, H. X. ^{[1
]}

Song, Z. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315040, Zhejiang, Peoples R China

来源：

MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2008年 / 59卷 / 10期

关键词：

Corrosion mechanisms - Corrosive electrolytes - Electrochemical test - Electrolyte solutions - Hno3 concentrations - Multiphase microstructure - Sintered NdFeB magnet - Sodium chloride (NaCl);

D O I：

10.1002/maco.200804175

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 Nd2Fe14B, Nd-rich phase, and B-rich phase. The corrosion behavior of NdFeB magnets in sodium hydroxide (NaOH), sodium chloride (NaCl), nitric acid (HNO3), and oxalic acid (H2C2O4) solutions was investigated by immersion and electrochemical tests. HNO3 is the strongest corrosive electrolyte compared with the other three solutions. The increase in HNO3 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 H2C2O4 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.

引用

页码：794 / 801

页数：8

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