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Green Inhibitor For Aluminium and Mild Steel in Acidic Media : A Case Study of Exudates of Eucalyptus Citriodora

M. A. Ezeokonkwo, P. O. Ukoha and N. J. N. Nnaji

Investigation of exudates of Eucalyptus citriodora as corrosion inhibitor of aluminium and mild steel was carried out using the weight loss technique. In various concentrations of hydrochloric acid solutions, the presence of exudates of Eucalyptus citriodora inhibited aluminium and mild steel corrosions. Phenomenon of physical adsorption is proposed for the inhibitions and the processes followed the Temkin adsorption isotherm. Free energies of adsorption indicate spontaneous adsorption. The equilibrium constants of the adsorption processes predict better corrosion inhibition of aluminium than mild steel. Lateral interaction from Temkin plots; suggest repulsive lateral interactions between inhibitor species.