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Inhibitive effect of chloroquine towards corrosion of mild steel in hydrochloric acid solution

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Abstract

Corrosion inhibition of mild steel (MS) by chloroquine (CQ) in 1 M HCl was investigated using weight loss, polarization, electrochemical impedance spectroscopy (EIS) and quantum chemical techniques. The inhibitor showed 99 % inhibition efficiency at concentration of 3.1 × 10−4 M. Polarization studies showed that CQ is a mixed-type inhibitor. Adsorption of inhibitor molecules on the MS surface showed Langmuir adsorption isotherm. Thermodynamic parameters led to the conclusion that adsorption is predominantly chemisorption. Quantum chemical calculations were carried out to investigate the corrosion-inhibiting property of CQ. Various parameters such as energy of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO), softness of molecule, Mullikan charges on various atoms and number of electrons transferred from inhibitor molecule to metal were calculated and correlated with the inhibiting property of CQ.

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Authors and Affiliations

  1. Department of Chemistry, School of Mathematical and Physical Sciences, North West University (Mafikeng Campus), Private Bag X2046, Mmabatho, 2735, South Africa

    Ashish Kumar Singh & Eno E. Ebenso

  2. Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi, 221005, India

    Shagufta Khan & M. A. Quraishi

  3. Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi, 221005, India

    Aditya Singh

  4. Department of Mechanical Engineering, Institute of Technology, Banaras Hindu University, Varanasi, 221005, India

    S. M. Quraishi

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  1. Ashish Kumar Singh
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Correspondence to Ashish Kumar Singh or M. A. Quraishi.

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Singh, A.K., Khan, S., Singh, A. et al. Inhibitive effect of chloroquine towards corrosion of mild steel in hydrochloric acid solution. Res Chem Intermed 39, 1191–1208 (2013). https://doi.org/10.1007/s11164-012-0677-8

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