Contribution to the corrosion inhibition of C38 steel in 1 M hydrochloric acid medium by a new epoxy resin PGEPPP

• A. Molhi^1,2, R. Hsissou³, M. Damej², A. Berisha^4,5, V. Thaçi⁴, A. Belafhaili⁶, M. Benmessaoud², N. Labjar⁷ and S. El Hajjaji¹

¹ Laboratory of Spectroscopy, Molecular Modelling Materials, Nanomaterial Water and Environment –CERNE2D, Faculty of Sciences, Mohammed V University in Rabat, Morocco
² Environment, Materials and Sustainable Development Team – CERNE2D, High School of Technology, Mohammed V University in Rabat, Morocco
³ Laboratory of Organic Chemistry, Catalysis and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 242, 14000, Kenitra, Morocco
⁴ Departments of Chemistry, Faculty of Natural and Mathematics Science, University of Prishtina, 10000 Prishtina, Kosovo
⁵ Materials Science-Nanochemistry Research Group, NanoAlb-Unit of Albanian Nanoscience and Nanotechnology, 1000 Tirana, Albania
⁶ Center for electron microscopy, Faculty of Sciences, Mohammed V University in Rabat, Morocco
⁷ Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERNE2D, ENSAM, Mohammed V University in Rabat, Morocco

Abstract: The objective of this work is to synthesize and evaluate the performance of pentaglycidyl ether pentaphenoxyphosphorus (PGEPPP) as a corrosion inhibitor of C38 steel in a 1 M hydrochloric acid solution. In these evaluations, we were using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and we will finish these studies by surface analysis using the scanning electron microscope (SEM) coupled with EDS. The results obtained were in good agreement, showing a significant increase in the inhibition efficiency (IE%) with the increase in the concentration of the inhibitor tested. It reaches a value of 97% for a concentration of 1 mM of PGEEPPP. The potentiodynamic polarization measurement indicates that the PGEPPP acts as a mixed-type inhibitor, thus thermodynamic parameters obtained from electrochemical impedance curves showed that adsorption of PGEPPP epoxy resin to the surface of C38 steel obeyed the Langmuir isothermal model and that the adsorption mechanism is physics. Analysis of the metal surface by SEM/EDS shows the formation of an inhibitor film as a barrier against corrosion of the C38 steel in a solution of 1 M HCl acid. DFT and Monte Carlo simulation studies revealed a good association with the experiment results.

Keywords: corrosion inhibition, epoxy resin, impedance, C38 steel, dynamic molecular

Int. J. Corros. Scale Inhib., 2021, 10, no. 1, 399-418 PDF (956 K)
doi: 10.17675/2305-6894-2021-10-1-23

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