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研究论文

模拟海洋大气环境中NdFeB(M35)初期腐蚀行为特征

  • 李春玲 ,
  • 马元泰 ,
  • 李瑛 ,
  • 王福会
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  • 中国科学院金属研究所金属腐蚀与防护国家重点实验室;

收稿日期: 2010-11-28

  修回日期: 2010-11-28

  网络出版日期: 2010-11-28

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

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

Received date: 2010-11-28

  Revised date: 2010-11-28

  Online published: 2010-11-28

摘要

研究模拟海洋大气环境中NdFeB(M35)初期的腐蚀行为.SEM观察表明,该材料初期腐蚀阶段,表面腐蚀过程存在3种代表性类型:Ⅰ)液滴同时覆盖富Nd相和磁性相,富Nd相先发生腐蚀;Ⅱ)液滴覆盖磁性相,磁性相腐蚀沿晶界扩展;Ⅲ)液滴在缺陷附近形成,腐蚀沿缺陷扩展.时间延长,局部腐蚀区相互连接,整体呈现晶界和富Nd相先行腐蚀,磁性相腐蚀相随其后.EDS分析给出腐蚀表面Na、Cl元素的分布,从而明确了腐蚀微电池的形成及腐蚀微电池点位变化是NdFeB(M35)腐蚀的外因.

本文引用格式

李春玲 , 马元泰 , 李瑛 , 王福会 . 模拟海洋大气环境中NdFeB(M35)初期腐蚀行为特征[J]. 电化学, 2010 , 16(4) : 406 -410 . DOI: 10.61558/2993-074X.2061

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.

参考文献

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