材料期刊网

将H3PO4加入H2SO4溶液有助于降低铅酸电池深放电后的硫化作用。研究Pb和Pb?In合金在纯H3PO4和含不同浓度H3PO4的H2SO4溶液中的阳极行为。使用动电位法、恒电位法和循环伏安法进行电化学测试。通过X射线衍射(XRD)、X射线能谱分析(EDX)和扫描电镜(SEM)对Pb和Pb?In合金表面钝化膜的成分和形貌进行表征。动电位研究表明测试溶液中的钝化电流密度随合金中In含量的增加而增加。向电解液中添加0.1 mol/L H3PO4对减小In含量更高(10%和15%)的合金表面的钝化膜厚度更有效。XRD、EDX和SEM数据表明在混合溶液中， PbSO4和PbO在合金表面的生成随合金中In含量的增加而减弱，且当In含量更高时(15%)完全停止。

The addition of phosphoric acid into sulfuric acid solution is mentioned to be helpful in the reduction of sulfation after deep discharge of lead-acid battery. The anodic behavior of Pb and Pb?In alloys was studied in pure phosphoric acid and sulfuric acid containing various concentrations of phosphoric. The electrochemical measurements were performed using potentiodynamic, potentiostatic and cyclic voltammetric techniques. The composition and morphology of passive layer formed on the surfaces of Pb and Pb?In alloys were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy analysis (EDX) and scanning electron microscopy (SEM). The potentiodynamic study shows that the passive current density increases with increasing the indium content in the alloy in the examined solutions. The addition of 0.1 mol/L H3PO4 into theelectrolyte is more effective to decrease the thickness of passive film on the surface of alloys containing higher indium content (10% and 15%). The XRD, EDX and SEM data reveal that the formation of PbSO4 and PbO on the surface decreases with increasing the indium level in the alloy and is completely prevented at higher indium content (15%) in mixed acid.