模拟海洋大气环境中NdFeB(M35)初期腐蚀行为特征 |
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引用本文: | 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. |
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作者姓名: | 李春玲 马元泰 李瑛 王福会 |
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作者单位: | 中国科学院金属研究所金属腐蚀与防护国家重点实验室; |
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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.
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关 键 词: | NdFeB(M35) 模拟海洋大气 原位观察 |
收稿时间: | 2010-11-28 |
Initial Stage of Atmospheric Corrosion of NdFeB(M35) in A Simulated Marine Atmosphere |
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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. |
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Keywords: | NdFeB(M35) simulated marine atmosphere in-situ observation |
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