研究了烧结Nd-Fe-B磁体在高压加速、中性盐雾和恒定湿热腐蚀环境中的腐蚀行为,讨论了合金成分对磁体耐蚀性的影响以及不同腐蚀环境下磁体的腐蚀特征.结果表明:以重稀土Dy替代部分Nd,及添加微量Co等元素,可以提高烧结Nd-Fe-B磁体的耐蚀性能.烧结Nd-Fe-B磁体在三种不同的腐蚀环境中的腐蚀产物和腐蚀形貌有着明显的不同.烧结Nd-Fe-B磁体在中性盐雾腐蚀环境中的腐蚀速率明显较高压加速腐蚀环境要快,这是由于高活性的氯离子扩散进基体表层,导致磁体表面的钝化膜遭到破坏,从而加剧磁体的电化学腐蚀进程.
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