摘要
在甲磺酸中电沉积铅-锑(Pb-Sb)合金,循环伏安实验表明Pb-Sb共沉积的起始电位约为-0.924 V(vs.Hg-Hg2SO4,饱和K2SO4),合金的共沉积受扩散控制。采用X射线衍射、扫描电子显微镜和能谱分析研究了阴极电流密度对镀层结构的影响。结果表明,随着阴极电流密度从5×10-3A/cm2增大至2.0×10-2A/cm2,镀层中Pb摩尔分数从33.6%增加到82.4%;随后随着电流密度进一步增加,Pb含量减少;所得镀层为面心立方(Fm3m)的Pb-Sb固熔体。运用电化学实验研究了该合金在硫酸介质中的电化学性能,证实Pb-Sb比纯Pb更适合作铅酸蓄电池的板栅材料。
Pb-Sb alloys were plated from methylsulfonic acid bath. The cyclic vohammetry experiments show that the initial co-deposition potential of the Pb-Sb alloy was about - 0. 924 V （ vs. Hg-Hg2 SO4, saturated K2SO4）, and the reduction co-deposition was controlled by diffusion. The effect of the cathodic current density on the structure of the Pb-Sb deposit was studied by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray, respectively. As a result, with the increase of the cathodic current density from 5 ×10 ^-3 to 2.0 × 10^ -2 A/cm2, the Pb molar ratio in the deposit increased from 33. 6 % to 82. 4 %. Further increasing the cathodic current density reduced the Pb content. The coating was a Pb-Sb solid solution with face centered lattice structure（ Fm3m ）. The electrochemical performance of the Pb-Sb deposit in sulphate acid was analyzed with electrochemical experiments, The results indicate that the Pb-Sb deposit is more suitable for lead-acid battery grid material than lead.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第11期1324-1329,共6页
Chinese Journal of Applied Chemistry
基金
福建省自然科学基金资助项目(E0640004)
关键词
甲磺酸
Pb-Sb合金
电沉积
电化学性能
铅酸蓄电池
methylsulfonic acid, Pb-Sb alloy, electrodeposition, electrochemical performance, lead-acid battery
