Corrosion Inhibition Studies on the Influence of Colocasia esculenta Leaves Extract on Mild Steel in 1.0 M HCl.

The ability of the ethanol extract of Colocasia esculenta leaves to inhibit mild steel corrosion in 1.0 M solution of HCl was examined using linear polarization along gravimetric methods at 303-333 K temperature range. Linear polarization experiments revealed Colocasia esculenta leaves extracts to retard mild steel dissolution in 1.0 M HCl by influencing both the anodic and cathodic half reactions on the steel surface. Inhibition efficiency of the leaves extract was a function of the concentration. Gravimetric data gave good fit with the Langmuir adsorption isotherm model while thermodynamic parameters derived from temperature evaluations showed the corrosion inhibition process to be spontaneous, exothermic and physisorptive.