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采用扫描电镜(SEM)研究在碱性电解液中通过恒电位沉积得到的铅粉。结果表明:铅晶体的形状主要取决于电沉积的过电位。通过欧姆控制步骤可以得到规则晶体。通过扩散控制得到的枝晶形状和电沉积的过电位有关系。不断增加的过电位导致枝晶的分枝从原始类型变成发达的三级分枝。基于该电解液属于络合铅电解液,解释具有强烈的(111)择优取向的枝晶分枝的形成原因。
Scanning electron microscopy (SEM) was used to study lead powders obtained by potentiostatic deposition in alkaline electrolyte. The results show that the shape of lead crystal mainly depends on the overpotential of electrodeposition. Regular crystals can be obtained by the ohmic control procedure. The dendritic shape obtained by diffusion control is related to the overpotential of electrodeposition. Increasing overpotential leads to the dendrite branching from the original type into a developed tertiary branch. Based on the fact that the electrolyte belongs to the complexing lead electrolyte, the reason for the formation of dendritic branching having a strong (111) preferred orientation is explained.