论文部分内容阅读
为提高铅酸蓄电池板栅材料的性能,在Pb-Ca-Sn-Al合金中添加了Sm-La二元稀土元素,研究其含量对显微结构和电化学性能的影响。利用金相和循环伏安、线性扫描、阻抗-电位、电化学阻抗谱等电化学测试方法对板栅性能进行了表征。结果表明:Sm-La稀土元素的加入促进合金晶粒细化,随其含量的增加,析出物颗粒变小并弥散分布。与添加Sm的合金相比,复合添加Sm-La的材料具有更低的析氢电位,改善了深放电时铅合金上所形成的阳极Pb(II)膜的阻抗特性,表现出良好的性能。
In order to improve the performance of grid material of lead-acid battery, Sm-La binary rare earth elements were added into Pb-Ca-Sn-Al alloy to study the influence of its content on microstructure and electrochemical performance. The grid performance was characterized by means of electrochemical tests such as metallography and cyclic voltammetry, linear sweep, impedance-potential, and electrochemical impedance spectroscopy. The results show that the addition of Sm-La rare earth element promotes the grain refinement of the alloy. With the increase of the content, the precipitate particles become smaller and disperse. Compared with the Sm-doped alloy, the Sm-La composite has a lower hydrogen evolution potential and improves the impedance characteristics of the anode Pb (II) film formed on the lead alloy during deep discharge, showing good performance.