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Corrosion Behavior of Sintered NdFeB Magnets in Differ- ent Acidic Solutions
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Corrosion Behavior of Sintered NdFeB Magnets in Differ- ent Acidic Solutions
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National Science and Technology Key Support Projects of China (2012BAE02B01); Major Science and Technology Special Projects of Jiangxi Province (2010AZX00200); Science and Technology Plan Projects of Jiangxi Province (20121BBE50001); Science and Technology Plan Projects of Department of Education of Jiangxi Province (KJ201109132281)

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    摘要:

    通過酸洗、浸泡法和電化學(xué)腐蝕測試分析了燒結(jié) NdFeB永磁體在不同濃度的 H2SO4 溶液、HCl溶液和 HNO3 溶液中的腐蝕行為。結(jié)果表明，燒結(jié) NdFeB磁體在 HNO3 溶液中的腐蝕機(jī)制為均勻腐蝕，而在H2SO4溶液和HCl溶液中的腐蝕機(jī)制為選擇性的晶間腐蝕。燒結(jié)NdFeB磁體在酸溶液中的腐蝕速率隨著酸溶液濃度的增加而增加。在浸泡試驗(yàn)和電化學(xué)腐蝕試驗(yàn)中，燒結(jié)NdFeB磁體在HNO3溶液中的腐蝕速率均最小。因此，HNO3溶液更適合作為燒結(jié)NdFeB磁體的酸洗液

    Abstract:

    Corrosion behaviors of sintered NdFeB magnets in H2SO4 solution, HCl solution and HNO3 solution of different concentrations were investigated by pickling, immersion test and electrochemical test. The results show that the corrosion mechanism of sintered NdFeB magnets in HNO3 solution is uniform corrosion, while the one in H2SO4 solution and HCl solution is selectively intergranular corrosion. The corrosion rate of NdFeB magnets increases with increasing of the concentrations of the three acid solutions, and the corrosion rate of NdFeB magnets in the HNO3 solution is the smallest among the three acid solutions both in immersion test and electrochemical test. Therefore, the HNO3 solution is more suitable to be used as the pickling solution for the surface pretreatment of sintered NdFeB magnets.

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徐吉林,黃政賢,羅軍明,鐘震晨. Corrosion Behavior of Sintered NdFeB Magnets in Differ- ent Acidic Solutions[J].稀有金屬材料與工程,2015,44(4):786~790.[Xu Jilin, Huang Zhengxian, Luo Junming, Zhong Zhenchen. Corrosion Behavior of Sintered NdFeB Magnets in Differ- ent Acidic Solutions[J]. Rare Metal Materials and Engineering,2015,44(4):786~790.]
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  • 收稿日期:2014-05-25
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  • 在線發(fā)布日期: 2015-06-08
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