Electrochemical and thermodynamic study of the inhibitory effect of triglycidyl ether tripropoxy triazine (TGETPT) on the corrosion of carbon steel E24 in 1 M hydrochloric acid medium

• M.E. Ansar¹, R. Hsissou², B.E. Ibrahimi³, A.A. Addi³, A. Molhi¹, M. Damej¹, S. El Hajjaji⁴ and M. Benmessaoud¹

¹ Environment, Materials and Sustainable Development Team – CERNE2D, High School of Technology, Mohammed V University in Rabat, Morocco
² Laboratory of Agro Resources. Polymers and Process Engineering (LAPPE). Team of Organic and Polymer Chemistry (TOCP). Faculty of Sciences, Ibn Tofail University in Kenitra, Morocco
³ Team of Physical Chemistry and Environment, Faculty of Science, Ibn Zohr University in Agadir, Morocco
⁴ Laboratory of Spectroscopy, Molecular Modelling Materials, Nanomaterial Water and Environment –CERNE2D, Faculty of Sciences, Mohammed V University in Rabat, Morocco

Abstract: Corrosion is of importance to multidisciplinary study groups as it includes materials science, chemistry, physics, metallurgy, and chemical engineering. Corrosion is induced by an environment’s chemical and electrochemical impact on metals and alloys. The objective of this work is to investigate the corrosion inhibition behavior of triglycidyl ether tripropoxy triazine (TGETPT) on of E24 steel in 1 M HCl. This study was carried out by electrochemical methods (polarization curves and electrochemical impedance spectroscopy). The polarization curves indicate that the inhibition mechanism is mainly acting as mixed-type inhibitor, and the corrosion rate of E24 in 1 M HCl is reduced 81.6% at inhibitor concentration of 10^–3 M. The electrochemical impedance diagrams show that the inhibition is a process of charge transfer on a heterogeneous surface for all tested TGETPT concentrations. Scanning electron microscope micrographs demonstrated that the epoxy prepolymer could effectively block the acid attack by physical adsorption on the surface of the carbon steel, the high correlation coefficient and low Standard Deviation and low Sum of Squares value gave the best fit for Langmuir isotherm. The effect of temperature on the corrosion behaviour with the addition of TGETPT was studied in the temperature range 293–323 K. The theoretical investigations through DFT-based quantum chemical calculations and molecular dynamics simulations are in good agreement with the experimental results.

Keywords: corrosion inhibition, polarization, impedance spectroscopy, E24, DFT

Int. J. Corros. Scale Inhib., 2023, 12, no. 3, 1065-1087
doi: 10.17675/2305-6894-2023-12-3-16

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