Corrosion behavior of Al100 − xCux (15 ≤ x ≤ 45) doped Nd–Fe–B magnets
Corrosion behavior of Al100 − xCux (15 ≤ x ≤ 45) doped Nd–Fe–B magnets
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DOI：
10.1016/j.matchemphys.2010.11.040
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发表时间：
2011-03
影响因子：
4.6
通讯作者：
M. Yan;J. Ni;T. Ma;Zubair Ahmad;Pei-bin Zhang
中科院分区：
文献类型：
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作者：
M. Yan;J. Ni;T. Ma;Zubair Ahmad;Pei-bin Zhang
使用动电位极化和电化学阻抗谱技术研究了 Al100−xCux(x=15, 25, 35, 45at.%) 掺杂 Nd-Fe-B 磁体在 0.005M H2SO4 溶液中的腐蚀行为。研究发现，随着铜含量的增加，耐腐蚀性首先提高，在x=35时达到最大值，然后降低。 Al65Cu35 掺杂磁体中最佳耐腐蚀性的存在归因于化学稳定性的提高和富 (Pr, Nd) 晶间相的分布/形态的优化。 Al55Cu45的添加表现出较差的耐腐蚀性，这主要是由于晶间相的粗化，进而导致基体相三联结处的活性反应通道的数量增加。
The corrosion behavior of Al100−xCux(x=15, 25, 35, 45at.%) doped Nd–Fe–B magnets has been investigated in 0.005M H2SO4solution using potentiodynamic polarization and electrochemical impedance spectroscopy techniques. It was found that the corrosion resistance first improves with the increase of copper content, reaches a maximum at x=35 and thereafter decreases. The existence of optimal corrosion resistance in the Al65Cu35doped magnets is attributed to both the increase of chemical stabilization and the optimization of distribution/morphologies of (Pr, Nd)-rich intergranular phases. Addition of Al55Cu45shows poorer corrosion resistance mainly due to coarsening of intergranular phases that, in turn, led to increasing the amount of active reaction channel at the triple junction of the matrix phase.