Investigation of imidazole derivatives as corrosion inhibitors for mild steel in sulfuric acidic environment: experiment
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ORIGINAL PAPER
Investigation of imidazole derivatives as corrosion inhibitors for mild steel in sulfuric acidic environment: experimental and theoretical studies M. Ouakki 1 & M. Galai 2 & M. Rbaa 3 & Ashraf S. Abousalem 4,5 & B. Lakhrissi 3 & E. H. Rifi 6 & M. Cherkaoui 1,7 Received: 24 August 2019 / Revised: 20 April 2020 / Accepted: 31 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, we are interested in studying the effect of the addition of three heterocyclic organic compound derived from imidazole, namely 2-(1,4,5-triphenyl-1H-imidazol-2-yl)phenol (IM-OH), 1,4,5-triphenyl-2-(4-metyoxyphenyl)-1H-imidazole (IM-OCH3), and 3-methoxy-4-(1,4,5-triphenyl-1H-imidazol-2-yl)phenol (IM-H) on the corrosion inhibition of mild steel in acidic medium H2SO4 0.5 M. This study was performed using weight loss and electrochemical and theoretical investigations. The obtained results indicate that IM-OH, IM-OCH3, and IM-H act as excellent inhibitors for mild steel in H2SO4 0.5 M. The results obtained from the electrochemical methods show that IM-OH, IM-OCH3, and IM-H imparted high resistance and behave as mixed type inhibitors. Inhibition efficiency (IE %) increases with the increase of inhibitors concentration to attain 97.7%, 98.9%, and 88.9% at 10−3 M of IM-OH, IM-OCH3, and IM-H respectively. EIS data is analyzed to model the inhibition process through appropriate equivalent circuit model. Thermodynamic and kinetic parameters controlling the adsorption process are calculated and discussed. In addition, the surface of the mild steel has been analyzed by the SEM-EDAX. The theoretical results were in good agreement with experimental measurements. Keywords Imidazole derivatives . Corrosion inhibition . SEM-EDAX . DFT . Molecular dynamic
Introduction
* M. Galai [email protected] 1
Laboratory of Materials, Electrochemistry and Environment (LMEE), Kenitra, Morocco
2
Laboratory of Materials Engineering and Environment: Modelling and Application (LMEEMA), Kenitra, Morocco
3
Laboratory of Organic Chemistry, Catalysis and Environment, Kenitra, Morocco
4
Department of Chemistry, Faculty of Science, Mansoura University, El-Mansoura 35516, Egypt
5
Quality Control LaboratoryOperations Department, Jotun Egypt, Cairo, Egypt
6
Laboratory of Organic Synthesis and Extraction Processes (LOSEP), Kenitra, Morocco
7
National Higher School of Chemistry (NHSC), University Ibn Tofail, BP. 133, 14000 Kenitra, Morocco
A number of physical, chemical, and mechanical properties favor the use of mild steel for construction and manufacturing purposes. Such properties include high carbon content of about 0.2 to 2.1% and ability to conduct electric current effectively without tarnishing the metal surface among others. Since it is prominently used as structural and instrumental material, the prevention of its corrosion is very essential [1, 2]. Many metallic installations in industries have suffered serious deterioration due to the aggressive nature of these acid solutions; there are various corro
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