Evaluation of manganese dioxide deposition on lead-based electrowinning anodes

摘要: Abstract In this study, the initial stages of MnO 2 electrodeposition on different lead-based electrowinning anodes (Pb–MnO and PbAg) in sulfuric acid electrolyte solutions were investigated. The deposition its preliminary effects oxidation studied using electrochemical techniques including potentiostatic polarization linear potential sweep voltammetry. polarizations accompanied by chemical analysis to investigate manganese rates anodes. Scanning electron microscopy (SEM) was employed characterize deposited layers. presence particles Pb–MnO composite anode contributed a very uniform, dense, stable layer. current distribution, Mn 3 + disproportionation rate 2+ rate, proposed as possible causes observed properties layer anode. grew quickly during stages. This became smoother over course polarization. Although hindered layer, effect more significant than conventional PbAg attributed layers these