Call For Paper Volume:4 Issue:10 Oct'2017 |

Thermodynamic, adsorption and electrochemical studies for corrosion inhibition of carbon steel by Terminalia chebula leaf extract in 0.5 M HCl medium

Publication Date : 28/03/2015



Author(s) :

Dr. A. Leema Rose , S. Vidhya .


Volume/Issue :
Volume 2
,
Issue 3
(03 - 2015)



Abstract :

Corrosion inhibition of mild steel in presence of Terminalia chebula leaf extract in 0.5 M HCl solution was investigated using weight loss, electrochemical impedance spectroscopy and potentio-dynamic polarization techniques. The effect of temperature on the corrosion behavior of carbon steel was studied in the temperature range 295–335 K . The inhibition efficiency increases with increasing inhibitor concentration but decreases with increasing temperature. The activation and free energies for the inhibition reaction support the mechanism of physical adsorption. The adsorption of T.C leaves on C- steel is endothermic, Spontaneous and obeys the Langmuir adsorption isotherm. The potentiodynamic study reveals that T. chebula leaves is a mixed type inhibitor. Surface and protective film was examined by scanning electron microscopy (SEM). The effect of temperature on the corrosion rate was investigated and some thermodynamic parameters were also calculated in order to explain the mechanism of adsorption. These thermodynamic parameters indicate a strong interaction between the inhibitor and the mild steel surface.


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Thermodynamic, adsorption and electrochemical studies for corrosion inhibition of carbon steel by Terminalia chebula leaf extract in 0.5 M HCl medium

March 28, 2015