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首页> 外文期刊>Physica, B. Condensed Matter >Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu_(60)Zn_(40) powders
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Corrosion resistance of NdFeB sintered magnets with intergranular addition of Cu_(60)Zn_(40) powders

机译：晶间添加Cu_（60）Zn_（40）粉末对NdFeB烧结磁体的耐腐蚀性

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摘要

Cu_(60)Zn_(40) powders, as grain boundary modifiers, were added into Nd_(28.2)Dy_(2.0)Fe_(bal)Al _(0.1)Nb_(0.2)Ga_(0.11)B_(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 Cu_(60)Zn _(40)-added magnets had more positive corrosion potential E _(corr) and much lower corrosion current density i_(corr) than the Cu_(60)Zn_(40)-free one in both solutions, indicating the improvement of the corrosion resistance by Cu_(60)Zn_(40) 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.
机译：将Cu_（60）Zn_（40）粉末作为晶界改性剂添加到Nd_（28.2）Dy_（2.0）Fe_（bal）Al _（0.1）Nb_（0.2）Ga_（0.11）B_（0.96）烧结磁体中提高磁体的耐腐蚀性。通过在3.5 wt％NaCl和3.0 wt％NaOH溶液中的极化曲线测量研究了磁体的耐腐蚀性。发现添加Cu_（60）Zn_（40）的磁体比不含Cu_（60）Zn_（40）的磁体具有更高的正腐蚀电位E _（corr），腐蚀电流密度i_（corr）低得多。两种溶液均表明，通过晶间添加Cu_（60）Zn_（40）可以提高耐蚀性。发现晶界相电化学势的提高，Nd（Fe，Cu）_2相的形成，富Nd相的均匀分布以及磁密度的增加是耐蚀性提高的原因。

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