Analysis of the properties and mechanisms of action of chamber corrosion inhibitors based on electrochemical impedance spectra

A methodology for analyzing the properties and mechanisms of action of chamber corrosion inhibitors using electrochemical impedance spectra, adequately described by the equivalent Mansfeld circuit, has been developed. The suggested approach makes it possible: to estimate the coefficient and degree of metal protection by the inhibitor; to estimate the degree of surface coverage with corrosion-blocking layers; to determine the predominant mechanism of corrosion inhibition. The informative value of the approach was illustrated by data on the effect on the electrochemical impedance spectra: of octadecylamine vapor pressure used in the chamber treatment of copper; of chamber treatment of steel with octadecylamine, benzotriazole and their mixtures with different ratios of the components; of time of zinc exposure in air after chamber treatment with ethylhexanoic acid.