Abstract
The electrochemical polarization behaviour of commercial 63/37 brass in n, n–dimethyl formamide (DMF)–water mixtures of varying composition at 30±0·1°C is reported. The form of the polarization curves indicates that corrosion of the brass is cathodically controlled and that the brass is anodically more active in the water rich than in the DMF rich region, but no clear passivity has been found. The open circuit potential of the test electrode in each solvent mixture shifts gradually in the noble direction with time. Both the immersion potential and the stable potential maximum shift to less noble values with increasing DMF content in the solvent mixture. The experimental findings are explained in terms of DMF molecule adsorption at the brass/solution interface, viscosity, dielectric constant, solvent pH, and preferential solvation of electrochemically dissolved metal ions by DMF.
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