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Experimental and theoretical study of the effect of some heterocyclic compounds on the corrosion of low carbon steel in 3.5% NaCl medium

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Abstract

The efficiency of three heterocyclic compounds, 3-amino-1,2,4-triazole, 4-hydroxy-2H-1-benzopyran-2-one and 4-hydroxy-3-(1H-1,2,4-triazole-3-ylazo)-2H-1-benzopyran-2-one (abbreviated 3-ATA, 4-HQ and 3-ATA-Q, respectively) as steel corrosion inhibitors in 3.5% NaCl has been investigated by Tafel extrapolation and linear polarization methods. Corrosion parameters and adsorption isotherms were determined from current-potential curves. It was found that inhibition efficiencies (η%) and surface coverage (θ) increase with an increase in the concentration of 3-ATA and 3-ATA-Q. However, 4-HQ accelerates the corrosion rate as its concentration increases. The adsorption of 3-ATA and 3-ATA-Q on the steel surface obey Langmuir isotherm. A clear correlation was found between corrosion inhibition efficiency and theoretical parameters obtained by the density functional B3LYP/6-31g(d) method. The experimental results are supported by the theoretical data.

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Authors and Affiliations

  1. Mineral Research and Exploration Institute, Ankara, Turkey

    M. Şahin

  2. Department of Physical Chemistry, Faculty of Science, Ankara University, Ankara, Turkey

    G. Gece & S. Bilgiç

  3. Department of Chemistry, Faculty of Arts and Sciences, Pamukkale University, Denizli, Turkey

    F. Karcı

Authors
  1. M. Şahin
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  2. G. Gece
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  3. F. Karcı
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  4. S. Bilgiç
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Correspondence to S. Bilgiç.

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Şahin, M., Gece, G., Karcı, F. et al. Experimental and theoretical study of the effect of some heterocyclic compounds on the corrosion of low carbon steel in 3.5% NaCl medium. J Appl Electrochem 38, 809–815 (2008). https://doi.org/10.1007/s10800-008-9517-3

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  • DOI: https://doi.org/10.1007/s10800-008-9517-3

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