Corrosion behavior of Al100-xCux (15 ≤ x ≤ 45) doped Nd-Fe-B magnets

被引：18

作者：

Yan, Mi ^{[1
]}

Ni, Junjie ^{[1
,2
]}

Ma, Tianyu ^{[1
]}

Ahmad, Zubair ^{[1
]}

Zhang, Pei ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China

[2] Liaocheng Univ, Coll Mat Sci & Engn, Liaocheng 252059, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2011年 / 126卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

NdFeB; Magnetic materials; Corrosion; Microstructure; SINTERED MAGNETS; INTERGRANULAR ADDITION; PERMANENT-MAGNETS; NDFEB MAGNETS; RESISTANCE; MICROSTRUCTURE; CO; NANOPOWDERS; IMPROVEMENT; COERCIVITY;

D O I：

10.1016/j.matchemphys.2010.11.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion behavior of Al100-xCux (x = 15, 25, 35, 45 at.%) doped Nd-Fe-B magnets has been investigated in 0.005 M H2SO4 solution 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 Al65Cu35 doped magnets is attributed to both the increase of chemical stabilization and the optimization of distribution/morphologies of (Pr, Nd)-rich intergranular phases. Addition of Al55Cu45 shows 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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：195 / 199

页数：5

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