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  • Chem Sci Trans., 2015, 4(4),  pp 927-939  

    DOI:10.7598/cst2015.1099

    Research Article

    Corrosion Inhibition of Aqueous Extract of Senna Auriculata Leaves on Carbon Steel in Hydrochloric Acid Medium

  • K. HEMA1,2, B. R.VENKATRAMAN2* and A. SUBRAMANIA3
  • 1Department of Chemistry, Saveetha School of Engineering, Saveetha University, Chennai-602 105, Tamil Nadu, India
    2Post Graduate and Research Department of Chemistry, Periyar E. V. R. College (Autonomous), Tiruchirappalli-620023, Tamil Nadu, India
    3Centre for Nanoscience and Technology, Pondicherry University, Puducherry-605014, India
  • Abstract

    The performance of Senna auriculata leaves (SCL) extract as a corrosion inhibitor for carbon steel in 1 N HCl was thoroughly investigated by chemical and electrochemical methods. The inhibition efficiency obtained by both these methods has good agreement with each other. The effects of temperature and immersion time on carbon steel in 1 N HCl were also studied. The maximum inhibition efficiency of 75.65% was obtained at the best concentration of 800 ppm of SCL extract. The polarization studies revealed that the inhibition action of SCL extract was under mixed control. The free energy of adsorption and the influence of temperature on the adsorption of SCL extract on carbon steel have also been reported. The adsorption of SCL extract on the surface of carbon steel was found to obey the Langmuir adsorption isotherm. The mechanism of inhibition was confirmed by kinetic and thermodynamic parameters obtained from 303 K to 363 K temperatures using weight loss method. The metallurgical microscope results established the formation of a protective layer on the carbon steel surface

    Keywords

    Corrosion inhibitors, Senna auriculata extract, Carbon steel corrosion

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