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A combined electrochemical and theoretical study of pyridine-based Schiff bases as novel corrosion inhibitors for mild steel in hydrochloric acid medium

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Abstract

Three pyridine-based Schiff bases namely \(\hbox {N}^{2}\hbox {,N}^{6}\)-bis(4-methylbenzylidene)pyridine-2,6-diamine (DAP-1), \(\hbox {N}^{2}\hbox {,N}^{6}\)-dibenzylidenepyridine-2,6-diamine (DAP-2) and \(\hbox {N}^{2}\hbox {,N}^{6}\)-bis(4-nitrobenzylidene)pyridine-2,6-diamine (DAP-3) were synthesized, characterized, and their corrosion inhibition performance was studied on mild steel (MS) in 1 M hydrochloric acid solution using electrochemical experiments and theoretical study. The results showed that all the three DAPs act as mixed type corrosion inhibitors, and are adsorbed on MS surface by following Langmuir adsorption isotherm. The methyl-substituted DAP-1 showed maximum inhibition effiency of 98.5% at \(40 \hbox { mgL}^{-1}\). The formation of inhibitor film on MS surface was confirmed by SEM and AFM. Quantum chemical calculations and Monte Carlo simulations were used to understand metal-inhibitor interaction and orientation of adsorption of DAP molecules. A good correlation was observed between theoretical and experimental results.

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Synopsis Three pyridine-based Schiff bases were synthesized, characterized, and their corrosion inhibition performance was studied on mild steel in 1 M HCl solution. Results of gravimetric measurements, potentiodynamic polarization, EIS, and SEM, AFM image analyses are reported. The inhibitor molecules follow Langmuir isotherm and showed mixed-type behavior. Experimental results were supported by DFT calculations and Monte Carlo simulations.

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Acknowledgements

PD gratefully acknowledges the financial support of the Ministry of Human Resources and Development (MHRD), New Delhi for providing the Senior Research Fellowship.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi, Uttar Pradesh, 221 005, India

    Parul Dohare

  2. Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    M A Quraishi & I B Obot

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  1. Parul Dohare
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  2. M A Quraishi
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Correspondence to M A Quraishi.

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Dohare, P., Quraishi, M.A. & Obot, I.B. A combined electrochemical and theoretical study of pyridine-based Schiff bases as novel corrosion inhibitors for mild steel in hydrochloric acid medium. J Chem Sci 130, 8 (2018). https://doi.org/10.1007/s12039-017-1408-x

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