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通过酸洗、浸泡法和电化学腐蚀测试分析了烧结Nd Fe B永磁体在不同浓度的H2SO4溶液、HCl溶液和HNO3溶液中的腐蚀行为。结果表明,烧结Nd Fe B磁体在HNO3溶液中的腐蚀机制为均匀腐蚀,而在H2SO4溶液和HCl溶液中的腐蚀机制为选择性的晶间腐蚀。烧结Nd Fe B磁体在酸溶液中的腐蚀速率随着酸溶液浓度的增加而增加。在浸泡试验和电化学腐蚀试验中,烧结Nd Fe B磁体在HNO3溶液中的腐蚀速率均最小。因此,HNO3溶液更适合作为烧结Nd Fe B磁体的酸洗液。
The corrosion behavior of sintered NdFeB permanent magnets in different concentrations of H2SO4 solution, HCl solution and HNO3 solution was analyzed by pickling, immersion and electrochemical corrosion tests. The results show that the corrosion mechanism of sintered NdFeB magnets in HNO3 solution is uniform corrosion, while the corrosion mechanism in H2SO4 solution and HCl solution is selective intergranular corrosion. The corrosion rate of sintered NdFeB magnets in acid solution increases with the increase of acid solution concentration. The corrosion rate of sintered NdFeB magnets in HNO3 solution was the lowest in immersion test and electrochemical corrosion test. Therefore, the HNO3 solution is more suitable as a pickling solution for sintered NdFeB magnets.