Role of water in the polarisation behaviour of some aluminium alloys in methylamine

Effect of water on the polarisation behaviour of some aluminium alloys (1060, 1100 and 3003) in methylamine has been carried out using potentiostatic method. S-shaped anodic curves have been obtained for all studied alloys in 0.5% and 0.1% methylamine except for 1060 alloy in 0.5% methylamine. In the presence of water, a shift in the anodic polarisation curves towards low region of current density has been observed. Cathodic polarisation curves reveal the fact that alloys are cathodically more polarised in 0.5% and 0.1% methylamine than in the other composition of methylamine.