Electrochemical and Theoretical Study of Corrosion Inhibition on Carbon Steel in 1M HCl Medium by 1,10-Bis(4-Amino-3-Met
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TECHNICAL ARTICLE—PEER-REVIEWED
Electrochemical and Theoretical Study of Corrosion Inhibition on Carbon Steel in 1M HCl Medium by 1,10-Bis(4-Amino-3-Methyl-1,2,4-Triazole-5-Thioyl)Decane D. Chebabe . S. Abbout . M. Damej . A. Oubair . Z. Lakbaibi . A. Dermaj . H. Benassaoui . M. Doubi . N. Hajjaji
Submitted: 15 November 2019 / in revised form: 18 April 2020 ASM International 2020
Abstract Corrosion inhibition using bolaamphiphile surfactants is related to the ability of these compounds to adsorb on liquid–solid interface. In this work, we have synthesized the 1,10-bis(4-amino-3-methyl-1,2,4-triazole5-thioyl)decane (DTC10) using a new method developed in our laboratory. The synthesized compounds have been purified and characterized by NMR1H and NMR13C spectroscopy. The inhibiting action of DTC10 toward the corrosion of carbon steel in HCl1M solution was investigated using potentiodynamic and electrochemical impedance spectroscopy. We have shown that this compound acts as very good inhibitor for carbon steel in 1M HCl. The values of the transfer resistance, obtained from impedance plots of carbon steel, increase by increasing inhibitor concentration and reach 92% for 103M of DTC10. The effects of temperature and immersion time on the inhibition efficiency have also been studied. The effect of temperature was studied between 298 and 328 K; the activation energy Ea and other thermodynamic parameters were calculated. Donating and anti-donating properties of the studied inhibitor 1,10-bis(4-amino-3-methyl-1,2,4-triazole-5-thioyl)decane (DTC10) were illustrated using nucleophilic P and electrophilic P? Parr functions based
D. Chebabe (&) A. Oubair Z. Lakbaibi Laboratory of Natural Substances & Synthesis and Molecular Dynamic, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, BP 509, Boutalamine, 52000 Errachidia, Morocco e-mail: [email protected] S. Abbout M. Damej A. Dermaj H. Benassaoui M. Doubi N. Hajjaji Laboratory of Materials Electrochemistry and Environment, Faculty of Sciences, University Ibn Tofail, B.P 133, 1400, Kenitra, Morocco
on the density functional theory (DFT). The computational Monte Carlo (MC) method was performed to study the adsorption behavior of DTC10 onto Fe(111) surface in the solution (presence of H3O?, Cl and H2O particles) and in the vacuum (absence of H3O?, Cl and H2O particles). Accordingly, the adsorption of DTC10 on the iron surface (111) is more preferred in the solution than in the vacuum. Keywords Bolaamphiphile Surfactant Inhibition Carbon steel HCl 1M DFT
Introduction Corrosion inhibition using heterocyclic organic compounds has been studied by some authors [1–5]. It has been accepted that their protective effect results from the formation of organic inhibitor films on the metal surface. The literature shows that the best inhibitor effect is obtained using surfactants compounds [3, 6, 7]. However, little work appears to have been done on the inhibiting of carbon steel in acidic media using bolaamphiphile surfactants. These
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