Inhibition efficiency of N-containing carboxylic and carboxy-phosphonic acids

Abstract

Organic compounds for protection against corrosion-mainly amino carboxylic acids and their N-phosphonomethyl derivatives -with or without additives (zinc or metavanadate ion) have been studied in neutral solution by three different methods via impedance spectroscopy, weight loss and potentiostatic polarization in order to show the significance of CH2-PO3H2 substitution and to detect a synergism in the presence of metals. For understanding the synergistic effect the stability of the zinc ion complex with organic acids was determined pH-metrically. © 1993.