CORROSION STUDIES IN AQUEOUS-ORGANIC BINARY SOLUTIONS I COPPER IN WATER - DMF MIXTURES.

Abstract

Corrosion behavior of copper in N,N-dimethylformamide-water mixtures has been studied at 30 plus or minus 1 degree C galvanostatically covering the whole range of solvent composition. The solvent composition has been found to have marked influence on the observed active, passive behavior of copper. Copper exhibited passivity in solvent mixtures containing above 40m///o DMF on impressing a small constant current, while larger currents are needed to observe passivity in solvent compositions below 40m///o DMF. The corrosion behavior has been explained in terms of various physicochemical properties of solvent mixtures and a semiempirical view has been speculated for the dissolution of copper.