Mn含量对La_(0.65)Mg_(0.35)Ni_(3.1-x)Mn_x(x=0.0～0.4)贮氢合金高温电化学性能的影响  

Effect of Mn Content on Electrochemical Properties of La_(0.65)Mg_(0.35)Ni_(3.1-x)Mn_x(x=0.0～0.4) Hydrogen Storage Alloys at High Temperature

作　　者：春林[1] 盛丹[1] 熊玮[2,3] 孔繁清[2,3] 闫慧忠[2,3] 赵增祺[2,3] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021 [2]稀土冶金及功能材料国家工程研究中心,内蒙古包头014030 [3]包头稀土研究院,内蒙古包头014030

出　　处：《稀土》2009年第4期1-5,共5页Chinese Rare Earths

基　　金：国际科技合作项目(2006DFB52550);国家自然科学基金项目(20363001)

摘　　要：研究了Mn含量对La0.65Mg0.35Ni3.1-xMnx(x=0.0,0.1,0.2,0.3,0.4)贮氢电极合金高温(333K)放电性能的影响。随Mn含量的增加,该系列合金电极在70 mA.g-1放电电流密度下的高温容量保持率从93.9%(x=0.0)增加到119.4%(x=0.4),而且,x>0.1合金的高温容量保持率几乎相同。333K的电化学P-C-T曲线测试结果表明,Mn对Ni的部分代替明显降低了合金的放氢平台压,x>0.1合金的吸/放氢平台滞后相对较小,说明x>0.1合金的高温特性有所改善。腐蚀曲线测量结果表明,由于合金中Mn的存在,合金电极的腐蚀电流Icorr减小,腐蚀电位Ecorr正移,表明合金的耐腐蚀性能增强。High temperature（333K） discharge performances of La0.65Mg0.35Ni3.1-xMnx（x=0.0,0.1,0.2,0.3,0.4）hydrogen storage alloy electrodes are investigated in this paper.The high temperature capacity retention of the alloy electrodes at 70mA·g-1 discharge current densities gradually increases from 93.9%（x=0.0） to 119.4%（x=0.4） with increasing Mn content in alloys,furthermore,the capacity retention of the alloy electrodes for the alloys of x0.1 is almost the same.The electrochemical P-C isotherms at 333K show that the partial substitution of Mn for Ni results in low desorption plateau pressure.For the alloys of x0.1,the hysteresis between the hydrogen absorption and desorption is relatively less than that of x≤ 0.1,which means that the high temperature discharge performance of alloy electrodes of x0.1 is improved.The corrosion curve measurements reveal that corrosion current（Icorr）decreases and corrosion voltage（Ecorr）increases due to the existence of Mn in alloys,which suggests that the anti-corrosion properties of the alloys are improved.

关 键 词：RE-Mg-Ni系贮氢合金 高温电化学性能 P-C-T曲线 腐蚀 

分 类 号：TG139.7[一般工业技术—材料科学与工程] O614.33[金属学及工艺—合金]