李红英,郝壮志,刘宇晖,朱望伟,陈云志,段俊颖.烧结NdFeB永磁体的腐蚀行为研究[J].稀有金属材料与工程,2018,47(5):1451~1458.[Li Hongying,Hao Zhuangzhi,Liu Yuhui,Zhu Wangwei,Chen Yunzhi,Duan Junying.Corrosion behavior of sintered Nd-Fe-B magnets[J].Rare Metal Materials and Engineering,2018,47(5):1451~1458.]
烧结NdFeB永磁体的腐蚀行为研究
投稿时间:2016-04-19  修订日期:2016-09-02
中文关键词:  钕铁硼  永磁材料  腐蚀  电化学  阻抗谱
基金项目:长沙市科技计划项目(项目号K1502018-11)
中文摘要:
      通过静态腐蚀实验,研究了烧结钕铁硼磁体在3.5 wt.% NaCl溶液中浸泡不同时间段的腐蚀特征。采用扫描电镜、拉曼光谱分析各个阶段的腐蚀形貌和腐蚀产物组成,通过动电位极化曲线、电化学阻抗谱研究不同腐蚀阶段磁体表面结构的变化及腐蚀机理,采用等效电路模型模拟各阶段的腐蚀行为。研究结果表明,烧结NdFeB磁体在3.5 wt.% NaCl溶液中依次发生点蚀、选择性晶间腐蚀、全面腐蚀行为,形成的腐蚀产物层结构疏松,只能产生短时减缓腐蚀速率的效果,而富钕相优先溶解会造成主相颗粒脱落,导致磁体粉化、破坏。腐蚀产物类型随腐蚀时间延长而有所变化,主要为铁和钕的氧化物或氢氧化物。
Corrosion behavior of sintered Nd-Fe-B magnets
英文关键词:NdFeB  Permanent magnet material  Corrosion  Electrochemistry  EIS
英文摘要:
      The corrosion behavior of Nd-Fe-B magnets was studied through immersion test in 3.5 wt.% NaCl solution. The morphology and composition of corrosion product were characterized by scanning electron microscope (SEM) and Raman spectroscopy. The corrosion behavior of the specimens were investigated by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The electrochemical equivalent circuits were used for fitting the EIS data. Results are as follows: Pitting corrosion, intergranularScorrosion and StotalScorrosion occurred in sequence during the immersion period. However, the corrosion product layer ofSlooseSstructure could only temporarily slow down the corrosion rate. At the initial stage, the Nd-rich phase atStheSgrain boundary preferentially dissolved into the media. Later the main phase particles were exposed to the corrosive solution and quicklyScorroded, causing a damage to the magnets. The corrosion products were mainly iron and neodymium oxides or hydroxides which was evolving with the immersion period.
作者单位E-mail
李红英 中南大学 材料科学与工程学院 lhying@csu.edu.cn 
郝壮志 中南大学 材料科学与工程学院 861061689@qq.com 
刘宇晖 湖南稀土新能源材料有限责任公司  
朱望伟 湖南稀土新能源材料有限责任公司  
陈云志 湖南稀土新能源材料有限责任公司  
段俊颖 中南大学 材料科学与工程学院  
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