Abstract
Electrochemical behaviour of commercial brass, 63/37 (Cu/Zn) in acetonitrile (AN) and water mixtures of varying compositions ( ie 2–100 m/o AN) at 30°C has been studied using accelerated weight loss method, solution analysis and potentiostatic polarization technique. It is found that during anodic polarization brass exhibits an active-passive transition in 2, 5, 10, 2o and 30 m/o AN, while no passivity has been observed in 50, 70, 95 and 100 m/o AN. Further the dissolution of brass has been found to be cathodically controlled. The open-circuit potential measurements show that as AN content in the solvent mixture increases, both immersion as well as steady potentials gradually shift towards less noble direction. The weight loss and solution analysis show preferential dissolution of zinc in the initial stages which progressively decreases with time.
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