Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu60Zn40 powders

Yeren Wu; Junjie Ni; Tianyu Ma; Mi Yan

doi:10.1016/j.physb.2010.04.065

Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu₆₀Zn₄₀ powders

Yeren Wu
, Junjie Ni
, Tianyu Ma
, Mi Yan

Zhejiang University

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Cu₆₀Zn₄₀ powders, as grain boundary modifiers, were added into Nd_28.2Dy_2.0Fe_balAl _0.1Nb_0.2Ga_0.11B_0.96 sintered magnets to improve the corrosion resistance of magnets. The corrosion resistance of magnets was investigated by polarization curve measurements in 3.5 wt% NaCl and 3.0 wt% NaOH solutions. It was found that the Cu₆₀Zn ₄₀-added magnets had more positive corrosion potential E _corr and much lower corrosion current density i_corr than the Cu₆₀Zn₄₀-free one in both solutions, indicating the improvement of the corrosion resistance by Cu₆₀Zn₄₀ intergranular addition. Promotion of the electrochemical potential of the intergranular phase, formation of the Nd (Fe, Cu)₂ phase, the uniform distribution of the Nd-rich phase and increase of the magnet density were found to be responsible for the improvement of the corrosion resistance.

Original language	English
Pages (from-to)	3303-3307
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	405
Issue number	16
DOIs	https://doi.org/10.1016/j.physb.2010.04.065
State	Published - 15 Aug 2010
Externally published	Yes

Keywords

Corrosion resistance
CuZn powders
NdFeB sintered magnets

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10.1016/j.physb.2010.04.065

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title = "Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu60Zn40 powders",

abstract = "Cu60Zn40 powders, as grain boundary modifiers, were added into Nd28.2Dy2.0FebalAl 0.1Nb0.2Ga0.11B0.96 sintered magnets to improve the corrosion resistance of magnets. The corrosion resistance of magnets was investigated by polarization curve measurements in 3.5 wt\% NaCl and 3.0 wt\% NaOH solutions. It was found that the Cu60Zn 40-added magnets had more positive corrosion potential E corr and much lower corrosion current density icorr than the Cu60Zn40-free one in both solutions, indicating the improvement of the corrosion resistance by Cu60Zn40 intergranular addition. Promotion of the electrochemical potential of the intergranular phase, formation of the Nd (Fe, Cu)2 phase, the uniform distribution of the Nd-rich phase and increase of the magnet density were found to be responsible for the improvement of the corrosion resistance.",

keywords = "Corrosion resistance, CuZn powders, NdFeB sintered magnets",

author = "Yeren Wu and Junjie Ni and Tianyu Ma and Mi Yan",

year = "2010",

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doi = "10.1016/j.physb.2010.04.065",

language = "英语",

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TY - JOUR

T1 - Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu60Zn40 powders

AU - Wu, Yeren

AU - Ni, Junjie

AU - Ma, Tianyu

AU - Yan, Mi

PY - 2010/8/15

Y1 - 2010/8/15

N2 - Cu60Zn40 powders, as grain boundary modifiers, were added into Nd28.2Dy2.0FebalAl 0.1Nb0.2Ga0.11B0.96 sintered magnets to improve the corrosion resistance of magnets. The corrosion resistance of magnets was investigated by polarization curve measurements in 3.5 wt% NaCl and 3.0 wt% NaOH solutions. It was found that the Cu60Zn 40-added magnets had more positive corrosion potential E corr and much lower corrosion current density icorr than the Cu60Zn40-free one in both solutions, indicating the improvement of the corrosion resistance by Cu60Zn40 intergranular addition. Promotion of the electrochemical potential of the intergranular phase, formation of the Nd (Fe, Cu)2 phase, the uniform distribution of the Nd-rich phase and increase of the magnet density were found to be responsible for the improvement of the corrosion resistance.

AB - Cu60Zn40 powders, as grain boundary modifiers, were added into Nd28.2Dy2.0FebalAl 0.1Nb0.2Ga0.11B0.96 sintered magnets to improve the corrosion resistance of magnets. The corrosion resistance of magnets was investigated by polarization curve measurements in 3.5 wt% NaCl and 3.0 wt% NaOH solutions. It was found that the Cu60Zn 40-added magnets had more positive corrosion potential E corr and much lower corrosion current density icorr than the Cu60Zn40-free one in both solutions, indicating the improvement of the corrosion resistance by Cu60Zn40 intergranular addition. Promotion of the electrochemical potential of the intergranular phase, formation of the Nd (Fe, Cu)2 phase, the uniform distribution of the Nd-rich phase and increase of the magnet density were found to be responsible for the improvement of the corrosion resistance.

KW - Corrosion resistance

KW - CuZn powders

KW - NdFeB sintered magnets

UR - https://www.scopus.com/pages/publications/77955305153

U2 - 10.1016/j.physb.2010.04.065

DO - 10.1016/j.physb.2010.04.065

M3 - 文章

AN - SCOPUS:77955305153

SN - 0921-4526

VL - 405

SP - 3303

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JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 16

ER -

Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu₆₀Zn₄₀ powders

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Keywords

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