Improvement on Corrosion Resistance of Sintered Nd-Fe-B with Bilayer Al/Cr Thin Films
Improvement on Corrosion Resistance of Sintered Nd-Fe-B with Bilayer Al/Cr Thin Films
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双层Al/Cr薄膜烧结Nd-Fe-B耐腐蚀性能的提高
DOI：
10.1016/j.jmmm.2022.170222
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发表时间：
2022-11
影响因子：
2.7
通讯作者：
Xuefeng Zhang
中科院分区：
文献类型：
--
作者：
Zhen Shi;Hang Zeng;Zejun Zhang;Xiaowei Zhang;Lidija Ćurković;Vilko M;ić;Song Fu;Wei Wang;Jun Liu;Lizhong Zhao;Xuefeng Zhang
Nd-Fe-B永磁体的腐蚀引起的不可挽回的磁损耗在工业应用中是非常令人关注的。表面涂层处理是提高耐蚀性的有效途径，但在追求耐蚀性的同时，也要考虑涂层引起的磁场强度劣化。本文在Nd-Fe-B磁体上制备了Al/Cr双层薄膜，研究了Nd-Fe-B磁体的腐蚀行为和力学性能。结果表明，在3.5wt%NaCl溶液中，厚度为510 nm的Al/Cr膜的耐蚀性能最好，腐蚀电流密度为2.08 × 10-7A/cm 2，比裸Nd-Fe-B磁体的腐蚀电流密度低两个数量级。双层结构的Al/Cr膜加上Cr2 O3钝化层可以有效地阻止腐蚀离子的渗透。此外，在Nd-Fe-B磁体上沉积Al/Cr薄膜对磁体的磁性能没有明显影响，且硬度和杨氏模量均有所提高。本工作表明，Al/Cr薄膜具有很大的潜力，可用于提供有效的腐蚀和机械保护的Nd-Fe-B磁体。
Corrosion induced irredeemable magnetic loss of Nd-Fe-B permanent magnets is of great concern in industrial applications. Surface coating treatment provides an effective approach for improving corrosion resistance, but the coating induced magnetic strength deterioration should also be taken into account, in addition to the pursuing of anti-corrosion performance. Herein, bilayer thin Al/Cr films were prepared on Nd-Fe-B magnets, the corrosion behavior and mechanical properties of Nd-Fe-B were investigated. The results revealed that Al/Cr film with 510 nm thickness provided the best anti-corrosion performance in 3.5 wt% NaCl solution, offering a corrosion current density of 2.08 × 10-7A/cm2which was two orders of magnitude lower than that of bare Nd-Fe-B magnets. Bilayer structured Al/Cr film with Cr2O3passivation layer can effectively prevent the penetration of the corrosive ions. In addition, deposition of Al/Cr film on Nd-Fe-B magnets gave no significant impact on the magnetic properties, furthermore, the hardness and Young's modulus were both improved. The present work demonstrated that Al/Cr films have great potential to be utilized for providing effective corrosion and mechanical protections for Nd-Fe-B magnets.
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作者：
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