Electrochemical Characteristics of Iron in Acidic Solutions Containing Ring-Substituted Benzoic Acids

Abstract

The electrochemical behavior of Armco iron in in the absence and presence of ring‐substituted benzoic acids have been investigated by the measurement of the corrosion potentials, open‐circuit capacitances, potential‐current polarization characteristics, potential transients, and corrosion rates. Anomalous behavior was observed for iron in the presence of para‐hydroxy‐benzoic acid. The corrosion rates of inhibited Armco iron followed a LFER with an adsorption mode of inhibition. The adsorption correlation indicated that increasing the electron density at the adsorption center increased inhibition. Corrosion inhibition of Armco iron by ring‐substituted benzoic acids increased in the following order: .