The growth of oxide layers on lead and its alloys at a constant potential in the PbO2 potential region at different temperatures

摘要: Abstract The growth of dense oxide layers on Pb, PbCa and PbCaSn alloys a low-Sb (0.85%) alloy is sulphuric acid solutions follows parabolic rate law at constant potential in the PbO2 region. This proves that oxidation controlled by diffusion process. In case antimonial with higher Sb content cannot be applied during early part oxidation, which probably due to addition reactions PbSb eutectic precipitated particles. Compared pure Pb all alloying agents studied increase effective decrease activation energy potential. These effects may an concentration oxygen vacancies layer, changes electronic conductivity layer or increased contribution grain boundary corrosion.