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Corrosion Inhibition of Mild Steel in 1.0 M HCl by Amino Compound: Electrochemical and DFT Studies

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Abstract

The purpose of this study was to examine the inhibitory effect of 4-amino-5-methyl-4H-1, 2, 4-triazole-3-thiol (AMTT) on the corrosion of mild steel in 1.0 M HCl solution using weight loss, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization. The results indicate that AMTT performed as a good mixed-type inhibitor for mild steel corrosion in a 1.0 M HCl solution, and the inhibition efficiencies increased and tend to saturate with inhibitor concentration. Potentiodynamic polarization results showed that AMTT is a mixed-type inhibitor. Adsorption of AMTT molecules is a spontaneous process, and its adsorption behavior obeys Langmuir’s adsorption isotherm model. The reactivity of AMTT was analyzed through theoretical calculations based on density functional theory. Results showed that the reactive sites were located on the nitrogen and sulfur (N1, N2, and S) atoms.

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Acknowledgments

One of the authors (AYM) gratefully acknowledges the Universiti Kebangsaan Malaysia for the support of this project under Grant No. UKM-GGPM-NBT-037-2011.

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Authors and Affiliations

  1. Department of Chemical Process Engineering, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia

    Ahmed Y. Musa (Senior Lecturer, Research Scientist), Abu Bakar Mohamad (Professors), Abdul Amir H. Kadhum (Professors) & Mohd Sobri Takriff (Professors)

  2. Department of Chemistry, Western University, London, ON, N6A 5B7, Canada

    Ahmed Y. Musa (Senior Lecturer, Research Scientist)

Authors
  1. Ahmed Y. Musa
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  2. Abu Bakar Mohamad
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  3. Abdul Amir H. Kadhum
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  4. Mohd Sobri Takriff
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Correspondence to Ahmed Y. Musa.

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Manuscript submitted February 13, 2011.

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Musa, A.Y., Mohamad, A.B., Kadhum, A.A.H. et al. Corrosion Inhibition of Mild Steel in 1.0 M HCl by Amino Compound: Electrochemical and DFT Studies. Metall Mater Trans A 43, 3379–3386 (2012). https://doi.org/10.1007/s11661-012-1122-8

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  • DOI: https://doi.org/10.1007/s11661-012-1122-8

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