Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Investigation of some Natural Product Extracts as Corrosion Inhibitors for Mild Steel in Acid Mediu

  • Subramania, A. (Advanced Materials Research Lab, Department of Industrial Chemistry, Alagappa University) ;
  • Sathiya Priya, A.R. (Advanced Materials Research Lab, Department of Industrial Chemistry, Alagappa University) ;
  • Saravanan, S. (Department of Chemistry, Jamal Mohamed College) ;
  • Abdul Nasser, A.J. (Department of Chemistry, Jamal Mohamed College) ;
  • Vasudevan, T. (Advanced Materials Research Lab, Department of Industrial Chemistry, Alagappa University)
  • Published : 2005.12.01
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Abstract

The inhibitive effect of extracts of tamarind seeds and jackfruit seeds, curry leaves and henna leaves on corrosion of mild steel in 1M HCl solution have been studied by weight loss, potentiodynamic polarization and impedance measurements. Results obtained from the electrochemical techniques were in good agreement with weight loss results. From the weight loss data, the values of surface coverage ($\Theta$) and corrosion rate were calculated. The inhibition efficiency (IE) increased with increasing inhibitor concentration in 1M HCl solution. In all the cases the adsorption of the natural product extracts on the mild steel surface from 1M HCl follows the Langmuir adsorption isotherm relationship. Potentiodynamic polarization studies reveal the fact that all the four natural product extracts act as mixed type inhibitors. The decrease in the inhibition efficiency follows the order: Extracts of jackfruit seed>henna leaves>curry leaves>tamarind seed.

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