• Oubair, A.
• Jabha, M.
• Ou-Ani, O.
• Znini, Mohamed
• Oucheikh, L.
• Youssefi, Y.
• Hammouti, B.
• Ebenso, E. E.

Abstract

This research aims to evaluate the anticorrosive properties of three olefins derivatives synthesized by the microwave oven technique in a dry environment. These olefins have been identified using different analytical methods, including NMR, IR and XRD. The corrosion inhibition of these compounds for carbon steel in 1 M HCl solution was studied using potentiodynamic polarization (PDP) curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX). The experimental results show that the tested compounds are good corrosion inhibitors for steel in an acidic media. Furthermore, the inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature. The PDP study showed the mixed type nature of these inhibitors, whereas thermodynamic parameters suggested that their adsorption obeys the Langmuir isotherm model. The EIS measurements revealed that the corrosion of the steel is produced by a single mechanism, which is charge transfer. SEM with EDX analysis confirmed the protection of the steel surface by the adsorption of the inhibitors. The relationship between the electronic properties of the inhibitors and the protective ability was further discussed using DFT calculations. Both experimental and theoretical results are well compatible and complement each other well.

Topics

• surface
• compound
• Carbon
• corrosion
• scanning electron microscopy
• x-ray diffraction
• steel
• density functional theory
• electrochemical-induced impedance spectroscopy
• Energy-dispersive X-ray spectroscopy
• Nuclear Magnetic Resonance spectroscopy