Inhibition effect of E and Z conformations of 2-pyridinealdazine on mild steel corrosion in phosphoric acid

Abstract

Purpose

This paper aims to study the inhibition effect of 2-pyridinealdazine on the corrosion of mild steel in an acidic medium. The inhibition effect was studied using weight loss, electrochemical impedance spectroscopy, and Tafel polarization measurements.

Design/methodology/approach

Weight loss measurements, potentiodynamic tests, electrochemical impedance spectroscopy, X-ray diffraction and spectral and conformational isomers analysis of A (E-PAA) and B (Z-PAA) were performed were investigated.

Findings

2-pyridinealdazine (PAA) acts as a good inhibitor for the corrosion of steel in 2.0 M H₃PO₄. The inhibition efficiency increases with an increase in inhibitor concentration but decreases with an increase in temperature.

Originality/value

This paper is intended to be added to the family of azines which are highly efficient inhibitors and can be used in the area of corrosion prevention and control.

Citation

Belghiti, M.E., Nahlé, A., Ansari, A., Karzazi, Y., Tighadouini, S., El Ouadi, Y., Dafali, A., Hammouti, B. and Radi, S. (2017), "Inhibition effect of E and Z conformations of 2-pyridinealdazine on mild steel corrosion in phosphoric acid", Anti-Corrosion Methods and Materials, Vol. 64 No. 1, pp. 23-35. https://doi.org/10.1108/ACMM-11-2015-1594