Changes in certain electrochemical properties of Fe and Zn electrodes within residual protective action of an organic inhibitor

This article discusses changes in time of certain electrochemical properties (corrosion potential, Ψ′-potential, and corrosion inhibition coefficient) under residual protective action within corrosion of Zn and Fe. These properties reflect stage-by-stage desorption of preliminary adsorbed inhibitor. The pattern of their changes in time is explained in terms of changes in adsorption interaction metal-inhibitor taking into account the essence of metal and inhibitor. Rather high coefficients of acid-corrosion inhibition of Fe and Zn are attributed to the simultaneous action of some specific factors, which increase adsorption of inhibitor on metals.