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Nd-Fe-B合金的組織與組成對其腐蝕行為的影響

Effect of Structure and Composition on Corrosion Behavior of Nd-Fe-B Alloy

  • 摘要: 研究了Nd-Fe-B合金的組織與組成對其腐蝕行為的影響。對Nd-Fe-B合金各主要組成相在純水和NaCl溶液中電位進行了測定,結果表明E(富Nd相)(基體相)(富B相)。Nd-Fe-B合金的腐蝕特征是晶界處的富釹相優先腐蝕,然后向晶粒內Nd2Fe14B基體相擴展。環境腐蝕試驗結果表明,Nd-Fe-B合金中加入Dy后,耐蝕性提高;加入Al后,則耐蝕性有所下降。

     

    Abstract: The effects of composition and structure on corrosion behavior ofNd-Fe-B alloy have been studied.The potentials of all main phase of Nd-Fe-B alloy in pure water and NaCl solution were measured.The order of potential is E(Nd-rieh)<E(Nd2Fe14B major phase)<E(B-rich).The corrosion characteristic of Nd-Fe-B permanent alloy is that the Nd-rich grain boundary phase in the alloy is easier to be corroded than the Nd2Fe14B grain phase.The experiment results of eviromented corrosion tests showed that the corrosion resistance of the Nd-Fe-B alloy in solution is improved by the addition of Dysprosium,but reduced by the addition of Aluminium to the alloy.

     

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