CORROSION STUDIES IN AQUEOUS-ORGANIC BINARY SOLUTIONS. COPPER IN ADMIXTURES OF WATER AND N-METHYLFORMAMIDE.

Abstract

This paper presents the results of corrosion studies of copper metal in various binary mixtures of N-methylformamide(NMF) and water by potentiostatic method. N-methylformamide is characterized by a high dielectric constant and is a powerful dissociating solvent. These binary mixtures are found to be corrosive to copper. Addition of small amount of NMF (0. 5 moles) to water increased the critical anode current density by a factor of 10**1-10**2. Scanning Electron Micrographs of the test-specimens after anodic polarization revealed pitting. The anodic behaviour of copper in above binary mixtures has been explained by complex forming ability of NMF. Spectral studies also confirm the complex formation.