Anodic Corrosion of Lead, Tin and Lead-Tin Alloys in Sulphuric Acid Solutions

摘要

The electrochemical behavior of lead and tin and the effect of tin on the anodic behavior of lead in sulfuric acid solutions has been studied in relation to the corrosion of the positive grid of the lead acid battery. The release of soluble Pb(IV) species into sulfuric acid during the anodic polarization of lead has been mapped using the ring-disk electrode technique and their role in the electrochemistry of lead is discussed. Part of the tetravalent products formed on lead are reduced only at high negative potentials. The usefulness of the rotating ring-disk electrode for the determination of different soluble corrosion products has been demonstrated. Mechanisms for tin dissolution in different regions (open circuit, active dissolution and passive region) have been proposed. Ex situ surface analysis of the anodic layer formed on the tin electrode showed this to be mainly SnO.