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  • Chem Sci Trans., 2014, 3(1),  pp 129-140  

    DOI:10.7598/cst2014.656

    Research Article

    Pavetta Indica Bark as Corrosion Inhibitor in Mild Steel Corrosion in HCl and H2SO4 Medium: Adsorption and Thermodynamic Study

  • V. N. SHEEJA and S. SUBHASHINI
  • Department of Chemistry, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore-43, Tamilnadu, India
  • Abstract

    Corrosion inhibition in the presence of Pavetta indica bark (PIB) extract in 1 M HCl and 1 M H2SO4 was studied using the weight loss technique at 303 to 353 K. The results obtained revealed that the inhibition efficiency increased with increase in temperature and showed maximum at 313 K. Inhibition occurred through adsorption of the molecules in PIB extract on the metal surface. The experimental data were best fit with Temkin isotherm model. The activation energies, enthalpies and entropies of the corrosion process and the free energies, enthalpies and entropies for the adsorption process were determined and discussed.

    Keywords

    Corrosion inhibitors, Mild steel, Pavetta indica Linn bark, Weight loss method, Physisorption, Temkin isotherm

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