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Cassia fistula Leaf-Extract Effect on Corrosion-Inhibition of Stainless-Steel in 0.5 M HCl

Omotosho, Olugbenga Adeshola and Okeniyi, Joshua Olusegun and Loto, Cleophas Akintoye and Popoola, Abimbola Patricia Idowu and Ajibola, Omokolade Babatunde and Ogbiye, Adebanji Samuel (2017) Cassia fistula Leaf-Extract Effect on Corrosion-Inhibition of Stainless-Steel in 0.5 M HCl. In: Proceedings of the 3rd Pan American Materials Congress. The Minerals, Metals & Materials Series (1). Springer International Publishing, Springer, Cham, pp. 179-189. ISBN 978-3-319-52131-2

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Abstract

This paper investigates Cassia fistula leaf-extract effects on the inhibition of stainless-steel corrosion in 0.5 M HCl. Measurements of corrosion rate were obtained through linear sweep voltammetry (LSV) technique, at the ambient temperature of 28 °C from stainless-steel specimens immersed in the acidic medium, containing different Cassia fistula leaf-extract concentrations. Results showed that inhibition effectiveness on stainless-steel corrosion increases with increasing concentration of the leaf-extract. The 10 g/L Cassia fistula leaf-extract, the highest concentration of the leaf-extract employed in the study, exhibited optimal inhibition efficiency η = 88.46% on the corrosion of the stainless-steel metal. Adsorption isotherm modelling shows that the experimental data followed the Flory-Huggins isotherm with excellent model efficiency, r2 = 90.27%, and the Langmuir model with very good model efficiency, r2 = 78.83%. Other isotherm parameters indicate favourable adsorption and suggest physisorption as the prevalent mechanism of corrosion protection by the leaf-extract on stainless-steel in the acidic chloride environment.

Item Type: Book Section
Uncontrolled Keywords: Linear sweep voltammetry; Corrosion rate; Cassia fistula leaf-extract; Stainless steel; Inhibition efficiency; Acidic chloride medium; Adsorption isotherm modelling
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
Q Science > QC Physics
Q Science > QD Chemistry
Q Science > QK Botany
T Technology > T Technology (General)
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TH Building construction
T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Faculty of Engineering, Science and Mathematics > School of Mathematics
Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Medicine, Health and Life Sciences > School of Biological Sciences
Depositing User: Dr Joshua Olusegun Okeniyi
Date Deposited: 28 Aug 2017 04:07
Last Modified: 28 Aug 2017 04:07
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/8750

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