Azadirachta Indica Extracts as Corrosion Inhibitor for Mild Steel in Acid Medium
2010; Elsevier BV; Volume: 5; Issue: 7 Linguagem: Inglês
10.1016/s1452-3981(23)15337-5
ISSN1452-3981
AutoresPeter C. Okafor, Eno E. Ebenso, Udofot J. Ekpe,
Tópico(s)Electrodeposition and Electroless Coatings
ResumoThe inhibitive action of leaves (LV), root (RT) and seeds (SD) extracts of Azadirachta indica on mild steel corrosion in H2SO4 solutions was studied using weight loss and gasometric techniques. The results obtained indicate that the extracts functioned as good inhibitors in H2SO4 solutions. Inhibition efficiency was found to increase with extracts concentration and temperature, and followed the trend: SD > RT > LV. A mechanism of chemical adsorption of the phytochemical components of the plant extracts on the surface of the metal is proposed for the inhibition behaviour. The experimental data fit into the Freundlich adsorption isotherm.
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