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电化学(中英文) ›› 2005, Vol. 11 ›› Issue (1): 12-15. 

• 研究论文 • 上一篇    下一篇

Mg_(2-x)La_xNi及Mg_(2-x)Ce_xNi合金的腐蚀性能研究

张海昌,杨化滨,王军红,周作祥   

  1. 南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所,南开大学新能源材料化学研究所 天津300071 ,天津300071 ,天津300071 ,天津300071
  • 收稿日期:2005-02-28 修回日期:2005-02-28 出版日期:2005-02-28 发布日期:2005-02-28

Corrosion Behavior of Mg_(2-x)La_xNi and Mg_(2-x)Ce_xNi Hydrogen Storage Alloy

ZHANG Hai-chang, YANG Hua-bin~*,WANG Jun-hong, ZHOU Zuo-xiang   

  1. (College of Chemistry Institute of New Energy Material Chemistry,Nankai University,Tianjin 300071,China
  • Received:2005-02-28 Revised:2005-02-28 Published:2005-02-28 Online:2005-02-28

摘要: 应用电化学方法研究了Mg2-xLaxNi及Mg2-xCexNi储氢合金的腐蚀性能.恒电位极化和交流阻抗测试表明,经Ce或La取代后的合金,其前者腐蚀电流及电化学极化电阻均随Ce取代量增加而降低,而后者的腐蚀电流却随La取代量的增加而增加,但极化电阻则呈先降后升趋势.合金极化后SEM测试显示,经Ce取代后合金表面较平整,而用La取代的则明显有裂纹.作者认为这主要与La、Ce的氧化物的结构有关.

关键词: 镁基储氢合金, 恒电位极化曲线, 交流阻抗

Abstract: The corrosion behavior of Mg-base hydrogen storage alloys has been investigated by potentiodynamic polarization and EIS. The results showed that the corrosion current density (i_(corr) ) and the electrochemical polarized resistance of Mg_(2-x)Ce_xNi alloys decreased with x increase, while i_(corr) of Mg_(2-x)La_xNi alloys increased and the electrochemical polarized resistance of Mg_(2-x)La_xNi alloys increased first, then decreased with x increase. SEM results showed that the surface of Mg_(1.85)Ce_(0.15)Ni alloy was relatively even while the surface of Mg_(2-x)La_xNi alloy had remarkedly cracks. The different behavior between Ce and La may be relevant to the structure of Ce, La oxides.

Key words: Mg-based hydrogen storage alloy, Potentiodynamic polarization, EIS

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