African Journal of Chemistry

African Journal of Chemistry ISSN 4391-3199 Vol. 5 (4), pp. 319-328, April, 2018. © International Scholars Journals

Full Length Research Paper

Adsorption and inhibitive properties of ethanol extracts of Musa sapientum peels as a green corrosion inhibitor for mild steel in H2SO4

Eddy, N. O1 and Ebenso, E. E 2*

1Department of Chemistry, Ahmadu Bello University, Zaria, Kaduna State Nigeria.

2Department of Chemistry and Chemical Technology, National University of Lesotho, P. O. Roma 180, Lesotho, Southern Africa.

Accepted 11 November, 2017

Abstract

The inhibition of the corrosion of mild steel by ethanol extract of Musa sapientum peels in H2SO4 has been studied using gasometric and thermometric methods. The results of the study reveal s that the different concentrations of ethanol extract of M. sapientum peels inhibit mild steel corrosion. Inhibition efficiency of the extract is found to vary with concentration, temperature, period of immersion and pH. Values of activation energy of the inhibited corrosion reaction of mild steel are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorption of M. sapientum peels extract on mild steel surface is spontaneous and occurred according to Langmuir and Frumkin adsorption isotherms. Physical adsorption mechanism has also been proposed for the adsorption of the inhibitor.

Key words: Corrosion inhibition, mild steel, Inhibition, adsorption, Musa sapientum, peels.