Theoretical Prediction and Experimental Study of Benzimidazole Derivate as a Novel Corrosion Inhibitor for Carbon Steel
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Theoretical Prediction and Experimental Study of Benzimidazole Derivate as a Novel Corrosion Inhibitor for Carbon Steel in 1.0 M HCl Y. El Aoufira, b, J. Sebhaouic, H. Lgaza, d, Y. El Bakric, A. Guenbourb, F. Bentisse, f, A. Zarroukg, *, E.M. Essassic, and H. Ouddaa aLaboratoire
de Chimie Organique, Inorganique, Electrochimie et Environnement, Ecole Supérieure d'éducation et de la Formation, Ibn Tofail University, PB 133-14050, Kenitra, Morocco b Laboratory of Materials, Nanotechnology and Environment, Mohammed V University, Faculty of Sciences, P.O. Box. 1014, Rabat, Morocco c Laboratoire de chimie organique heterocyclique, URAC 21, Pôle de compétence pharmacochimie, Université Mohammed V, Faculté des sciences, Rabat, Maroc dLaboratory of Applied Chemistry and Environment, ENSA, Ibn Zohr University, PO Box 1136, Agadir, 80000 Morocco eLaboratoire de Catalyse et de Corrosion des Matériaux (LCCM), Faculté des Sciences, Université Chouaib Doukkali, B.P. 20, El Jadida, M-24000 Morocco fLille University, ENSCL, UMET CNRS UMR 8207, Lille, F-59000 France gLaboratory of Materials, Nanotechnology, and Environment, Mohammed V University, Faculty of Sciences, P.O. Box. 1014, Rabat, Morocco *e-mail: [email protected] Received March 30, 2018; revised April 15, 2020; accepted April 22, 2020
Abstract—The inhibiting effect of benzimidazole derivate (DBI) on corrosion of carbon steel (CS) at temperature range of 303–333 K was investigated in hydrochloric acid by DC potential dynamic polarization and AC electrochemical impedance spectroscopy. It was found that this compound behaved as a mixed-type inhibitor with predominantly cathodic effect. The EIS results indicate that the inhibition efficiency increases with increasing the inhibitor concentration and the maximum inhibition (%) was obtained in the presence of 10−3 M of DBI. The adsorption of DBI on the carbon steel surface is described by the Langmuir adsorption isotherm and had a physical and chemical mechanism. The results found experimentally were corroborated by DFT-quantum chemical calculations and molecular dynamics simulations (MDS) methods. Keywords: corrosion inhibition, carbon steel, EIS, PDP, DFT, molecular dynamics simulations DOI: 10.1134/S2070205120050056
1. INTRODUCTION Corrosion of metals is reckoned amongst the most significant and challenging problems in industry. Carbon steel (CS) is used in mass amounts in marine applications, chemical processing, petroleum production and refining, storage tanks, reaction vessels, chemical batteries, construction, and metal processing equipment. Hydrochloric acid (HCl) solutions commonly used throughout pickling, industrial acid cleaning, acid de-scaling, and oil well acidifying processes cause corrosion of steel. Thereby, the use of corrosion inhibitors increases continually to protect the metal from corrosion by development of inhibiting films [1–6]. The mechanism of their action can be different, depending on the metal, the medium and the structure of the inhibitor substan
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