A comparison of methods for corrosion inhibitor assessment: Mild steel protected by disubstituted aromatics

Abstract

Both thermodynamic and kinetic corrosion process parameters are determined with electrochemical methods. Results are used for a deeper understanding of the established interfacial structures and ongoing processes and of the effects of experimental parameters. Frequently data are used for the evaluation of corrosion inhibitor efficiencies. In case data from just one electrochemical method are used, the validity of the method and data should be verified and critical points must be identified. In this study, we have compared results from three standard electrochemical methods obtained with a common steel sample in an acidic environment and in the presence of three representative aromatic inhibitors. We have noticed significant differences between the results; therefore we suggest rationalization and practical consequences.

o-Toluidine in electrochemistry – an overview

“…o-Phenylenediamine turned out to be the most efficient; this can be taken as an example for a critical examination of the real need to use o-toluidine and to replace it with a less toxic and even more efficient molecule. The minor limitation of this report -only one electrochemical method has been used in addition to hydrogen permeation studies -has been amended in a more recent report [55] wherein three standard electrochemical methods have been used confirming the conclusion of the earlier report.…”

“…Fig.3Potentiodynamic polarization curves for a mild steel C15 sample in 1 M HCl solution without/with inhibitor 6 mM o-toluidine (further details see[55])…”