机器人铅酸电池材料组织转变及电化学行为

通过对比实验方法研究了机器人铅酸电池Pb-Sb合金的胞/枝晶转变和电化学行为。采用EIS、极化曲线和等效电路分析研究了定向水冷凝固系统制备Pb-2.2%(质量分数)Sb合金试样在室温条件下H_2SO_4溶液中的腐蚀抗性。研究结果表明,胞状组织Pb-2.2%(质量分数)Sb电流密度为树枝晶组织的1/3。Pb-2.2%(质量分数)Sb合金比Pb-1%(质量分数)Sb和Pb-6.6%(质量分数)Sb合金的电流密度低,具有作为铅酸电池正极格栅的应用潜力。低冷却速率(0.6℃/s)的传统铸造工艺可获得粗的胞晶间距,从而获得良好的电化学腐蚀抗性,适用于制备Pb-2.2%(质量分数)Sb合金格栅。

Tissue transformation and electrochemical behavior of material of robot lead acid battery

The aim of this article was focused on a comparative experimental study of the electrochemical feature of as-cast Pb-2.2％ Sb alloy with cellular/dendritic transition for applications in the manufacturing of robots lead-acid battery parts.A water-cooled unidirectional solidification system was used to obtain the alloy samples.Electrochemical impedance spectroscopy (EIS) plots,potentiodynamic polarization curves and equivalent circuit analysis were used to evaluate corrosion resistance in a 0.5 mol/L H2SO4 solution at 25 C.The cellular Pb-2.2％ Sb alloy was found to have a current density which was of about 3 times lower than that of the dendritic Pb-2.2％ Sb alloy.The Pb-2.2％ Sb alloy had lower current density than both the Pb-1％ Sb and the Pb-6.6％ Sb alloys evidencing its potential for application as positive grid material in lead-acid batteries.It was also verified that a conventional casting with low cooling rate of about 0.6 C/s produces coarser cellular spacings which was more appropriate for the manufacturing of the Pb-2.2％ Sb alloys grids due to its corresponding electrochemical behavior.