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Inhibition of mild steel corrosion in 0.5 H2SO4 with leaves extract

Author:S.V. Priya and R. Saratha

Abstract:
Corrosion inhibition of mild steel in 0.5 M H2SO4 was investigated in the absence and presence of different concentrations of extract of Crossandra infudibuliformis leaves [C.I.L]. Weight loss measurements and electrochemical studies were employed. The results obtained show that the inhibition was found to increase with increasing concentration of the plant extract. The inhibitive actions of plant extract are discussed on the basis of adsorption of stable complex at the mild steel surface. Theoretical fitting of different isotherms were tested to clarify the nature of adsorption. Polarization curves revealed that C.I.L inhibitor acts as mixed type inhibitor and the inhibition efficiency up to 96.40% was obtained.