Inhibition of Mild Steel Corrosion in Acidic Medium by Telfairia occidentalis Rind Extract
Inemesit A. Akpan
Department of Chemistry, University of Uyo, P.M.B. 1017, Uyo, Nigeria
Okon U. Abakedi *
Department of Chemistry, University of Uyo, P.M.B. 1017, Uyo, Nigeria
Mfon A. James
Department of Chemistry, University of Uyo, P.M.B. 1017, Uyo, Nigeria
*Author to whom correspondence should be addressed.
Abstract
Telfairia occidentalis rind extract has been studied as a potential green inhibitor for mild steel corrosion in 1 M H2SO4 using weight loss and hydrogen evolution methods. The results of the investigation reveal that Telfairia occidentalis rind extract is a good inhibitor of mild steel corrosion in sulphuric acid solution. The inhibition efficiency increases with increase in rind extract concentration but decreases with increase in temperature. The calculated thermodynamic parameters reveal that the corrosion inhibition process was endothermic and spontaneous. Physical adsorption has been proposed for the adsorption of Telfairia occidentalis rind extract onto mild steel surface. The adsorption of the extract on mild steel surface obeys the Langmuir adsorption isotherm.
Keywords: Telfairia occidentalis, mild steel, corrosion inhibition, physisorption, Langmuir isotherm