Etude de l’activité anticorrosive d’une série d’azomethines

Abstract

A study was conducted on two newly developed compounds, azomethines, named N1-(coumarin-7-yl) amidrazone (Azo-Cum) and ((1Z)-N, (2-phenylthio)phenyl), N’, [2-(phenoxyphenyl]-2-oxopropanehydrazonamide (SB). To assess their impact on the corrosion of carbon steel XC48 in a 1 M hydrochloric acid (HCl) solution. Various analytical techniques, including weight loss, potentiodynamic polarization (PDP), impedance spectroscopy (EIS), cyclic voltammetry (CV), UV–visible spectroscopy, scanning electron microscopy (SEM), and AFM, were employed to evaluate the inhibitory efficiency of the compounds. The findings indicated that inhibition efficiency rose with higher concentrations but decreased with elevated temperatures. According to weight loss analysis, the optimal concentration of the Azo-Cum inhibitor at 5 ×10−4 M exhibited a maximum efficiency of 89.26% where at 10-3 M the SB efficiency was 92.92%. Polarization studies disclosed that the inhibitors acted as mixed-type inhibitors with a cathodic predominance. The adsorption of the two compounds on the carbon steel surface followed the Langmuir adsorption isotherm. Additionally, the study explored the synergistic effect of Azo-Cum in combination with KI on steel XC48 corrosion in a 1 M HCl (Blank) solution using potentiodynamic polarization measurements. The results identified concentration ranges that demonstrated antagonistic inhibition. Density functional theory (DFT) and molecular dynamic simulation (MSD) calculations show the existence of a correlation between the molecular structure of the inhibitors studied and their inhibitory powers.