Omotosho, Olugbenga Adeshola and Okeniyi, Joshua Olusegun and Loto, C. A. 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
Full text not available from this repository.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.
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