Initial Stage of Atmospheric Corrosion of NdFeB(M35) in A Simulated Marine Atmosphere

Authors

Chun-ling LI, State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;
Yuan-tai MA, State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;
Ying LI, State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;
Fu-hui WANG, State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;

Abstract

This study detailed the atmospheric corrosion behaviour of sintered NdFeB(M35) in a simulated marine atmosphere with 80% relative humidity(RH).The dissolution and subsequent reaction of NaCl particles cause the attack of NdFeB.The corrosion presented three representative types:if the electrolyte covered magnetic phase and Nd-rich phase,the Nd-rich phase was corroded firstly due to galvanic effect;if the electrolyte covered magnetic phase,magnetic phase was corroded along the grain boundary;if the electrolyte located near the position of defects,corrosion progressed along with the defect because of low concentration of oxygen inside the defect.With corrosion progressing,local corrosion areas were mutually connected,with Nd-rich phase and grain boundary being corroded first,magnetic phase was corroded subsequently.

Keywords

NdFeB(M35), simulated marine atmosphere, in-situ observation

DOI Link

https://doi.org/10.61558/2993-074X.2061

Publication Date

2010-11-28

Online Available Date

2010-11-28

Revised Date

2010-11-28

Received Date

2010-11-28

Recommended Citation

Chun-ling LI, Yuan-tai MA, Ying LI, Fu-hui WANG. Initial Stage of Atmospheric Corrosion of NdFeB(M35) in A Simulated Marine Atmosphere[J]. Journal of Electrochemistry, 2010 , 16(4): 406-410.
DOI: 10.61558/2993-074X.2061
Available at: https://jelectrochem.xmu.edu.cn/journal/vol16/iss4/7

References

[1]Rodewald W,Wall B,Katter M.Top Nd-Fe-B magnetswith greater than 56 MGOe energy density and 9.8 kOecoercivity[J].IEEE Trans Magn,2002,38:2955-2957.
[2]Schultz L,El-Aziz A M,Barkleit G,et al.Corrosion be-haviour of Nd-Fe-B permanent magnetic alloys[J].Ma-ter Sci&Eng A,1999,267:307-313.
[3]El-Moneim A A.Passivity and its breakdown of sinteredNdFeB-based magnets in chloride containing solution[J].Corros Sci,2004,46:2517-2532.
[4]Chen C,Breslin C B,Mansfeld F.Scanning Kelvin probeanalysis of the potential distribution under small drops ofelectrolyte[J].Mater Corros,1998,49:569-575.
[5]Weissenrieder J,Leygral C.In situ studies of filiformcorrosion of iron[J].J Electrochem Soc,2004,151:165-171.