The Effect of Molybdate Ion on the Behaviour of Tin in Sodium Hydroxide Solution

Abstract

The effect of molybdate ion on the potential of tin electrode was measured in different concentrations of sodium hydroxide solutions and the steady state potential vs. pH of the solution showed that tin behaves as Sn/SnO couple. The potential of tin was measured also in the pure alkali and containing different concentrations of molybdate ion. The results showed that potential decreases with increase of molybdate concentrations indicating the acceleration of cathodic reaction. Anodic polarisation measurements showed that increase of molydbate ion concentration delays the onset of passivity. Cathodic polarisation curves were also measured. The results confirmed the acceleration of the cathodic reaction with increase of molybdate concentration.