采用直流磁控溅射技术在烧结型NdFeB永磁体表面沉积Al薄膜，研究了喷丸和铬酸盐化学转化后处理方法对Al薄膜微观形貌和耐腐蚀性能的影响。研究表明，喷丸可以有效地减少铝薄膜的孔隙率，提高膜层的致密性；喷丸压力为0.20 MPa时，Al膜层的致密性最好且不会剥落；喷丸和化学转化复合后处理可以极大程度地提高Al薄膜的耐蚀性，其耐中性盐雾腐蚀时间可由镀态时的155 h提高到320 h。
Aluminum film was deposited on the surface of sintered NdFeB permanent magnet by direct current magnetron sputtering. The influence of post-treatment including shot blasting and chemical conversion on micro-morphology and corrosion resistance of Al film were studied. The results indicated that shot blasting can effectively decrease the porosity of Al film and increase its compactness. The Al film treated by shot lasting at a pressure of 0.2 MPa has the best compactness and will not peel off. The resistance of the Al film to neutral salt spray corrosion is significantly improved from 155 h as plated to 320 h by the combination of shot blasting and chemical conversion.
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