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  • Chem Sci Trans., 2014, 3(1),  pp 240-254  

    DOI:10.7598/cst2014.698

    Research Article

    Inhibitory Action of Pavetta Indica Leaf Extracts on the Corrosion of Mild Steel in Acid Media

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

    The anticorrosive nature of Pavetta Indica Leaf extract (PIL) on mild steel corrosion in HCl and H2SO4 media has been studied by weight loss and electrochemical methods. The results of the study revealed that the acid extracts of PIL inhibit mild steel corrosion.The inhibition efficiency increases with increase in concentration of inhibitor. Potentiodynamic polarization studies clearly revealed that the PIL act as mixed type of inhibitor without changing the mechanism of hydrogen evolution reaction. Changes in impedance parameters are indicative of adsorption of the biomaterial on the metal surface leading to the formation of a protective layer which grows with increasing exposure time. The protective film formed on the metal surface was confirmed by SEM. Values of inhibition efficiency obtained from different methods are in good agreement and dependent upon the concentration of inhibitor.

    Keywords

    Corrosion inhibitiors, Mild steel, Acid media, Electrochemical impedance spectroscopy, Polarisation curves, Pavetta Indica Linn Leaf

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