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Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media |
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| Authors: | P.C. Okafor M.E. Ikpi E.E. Ebenso U.J. Ekpe |
| Affiliation: | a Department of Pure and Applied Chemistry, University of Calabar, PMB 1115, Calabar, Nigeria b Department of Chemistry and Chemical Technology, National University of Lesotho, P.O. Roma 180, Lesotho, South Africa c Department of Chemistry, University of Uyo, PMB 1017, Uyo, Nigeria |
| Abstract: | The inhibitive action of leaves (LV), seeds (SD) and a combination of leaves and seeds (LVSD) extracts of Phyllanthus amarus on mild steel corrosion in HCl and H2SO4 solutions was studied using weight loss and gasometric techniques. The results indicate that the extracts functioned as a good inhibitor in both environments and inhibition efficiency increased with extracts concentration. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and activation energies decreased in the presence of the extract. A mechanism of chemical adsorption of the plants components on the surface of the metal is proposed for the inhibition behaviour. The adsorption characteristics of the inhibitor were approximated by Temkin isotherm. |
| Keywords: | Mild steel Corrosion inhibition Phyllanthus amarus |
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