Journal of Applied Electrochemistry

, Volume 38, Issue 6, pp 809–815

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

Original Paper

DOI: 10.1007/s10800-008-9517-3

Cite this article as:
Şahin, M., Gece, G., Karcı, F. et al. J Appl Electrochem (2008) 38: 809. doi:10.1007/s10800-008-9517-3
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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.

Keywords

SteelCorrosionInhibitorHeterocyclic compoundsTheoretical calculations

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Mineral Research and Exploration InstituteAnkaraTurkey
  2. 2.Department of Physical Chemistry, Faculty of ScienceAnkara UniversityAnkaraTurkey
  3. 3.Department of Chemistry, Faculty of Arts and SciencesPamukkale UniversityDenizliTurkey