对烧结NdFeB磁体作Al-Mn合金镀可以提高其耐腐蚀性能,但这只能在无水体系中进行.以MnCl2-AlCl3-BMIC(氯化1-丁基-3-甲基咪唑)为离子液体(AlCl3与BMIC的摩尔比为2∶1),对NdFeB磁体电沉积Al-Mn合金.采用SEM扫描电镜观察了Al-Mn镀层的形貌,采用X射线衍射分析了相结构,采用3.5％NaCl溶液测试了耐腐蚀性能；探讨了离子液体中MnCl2浓度对Al-Mn合金镀层结构及性能的影响.结果表明:NdFeB磁体表面电沉积Al-Mn合金,当离子液体中MnCl2浓度为0.05～0.25 mol/L时,Al-Mn合金镀层的结构由晶态逐渐转变为非晶态,耐腐蚀性能显著提高,且优于铝镀层.
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