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Inhibition and mechanism of Terminalia catappa on mild-steel corrosion in sulphuric-acid environment

Inhibition and mechanism of Terminalia catappa on mild-steel corrosion in sulphuric-acid environment Mild-steel samples were immersed in 0.5 M H2SO4 having different concentrations of Terminalia catappa leaf-extract for investigating inhibition and mechanism of the leaf-extract on mild-steel corrosion in the testenvironment. Corrosion-rate measurements were obtained by potentiodynamic polarisation and gravimetric techniques and analysed for detailing sustainable corrosion-protection by the natural-plant in the test-environment. Results indicate potentiodynamic corrosion-rate correlated excellently (R = 99.25%, Nash-Sutcliffe efficiency (NSE) = 98.52%, ANOVA p-value = 0.0222) with function of the gravimetric corrosion-rate and the leaf-extract concentration. By the experimental and correlated results, inhibition effectiveness on mild-steel corrosion increased with increasing leaf-extract concentration up to the 8 g/L Terminalia catappa leaf-extract, which exhibited optimal inhibition efficiency, = 99.99% (experimental model) or = 95.45% (correlation prediction). Correlation prediction, potentiodynamic and gravimetric data Copyright © 2016 Inderscience Enterprises Ltd. followed the Langmuir and the Flory-Huggins adsorption isotherms with agreements of favourable adsorption/prevalent physisorption mechanism for the leaf-extract corrosion-protection of mild-steel in the test-environment. Keywords: Terminalia catappa; mild steel corrosion; corrosion inhibition; corrosion mechanism; sulphuric-acid environment; potentiodynamic polarisation; gravimetric technique; correlation analysis; adsorption isotherms; sustainable corrosion protection. Reference to this paper should be made as follows: Omotosho, O.A., Okeniyi, J.O., Oni, A.B., Makinwa, T.O., Ajibola, O.B., Fademi, E.O.J., Obi, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Progress in Industrial Ecology, an International Journal Inderscience Publishers

Inhibition and mechanism of Terminalia catappa on mild-steel corrosion in sulphuric-acid environment

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Publisher
Inderscience Publishers
Copyright
Copyright © 2016 Inderscience Enterprises Ltd.
ISSN
1476-8917
eISSN
1478-8764
DOI
10.1504/PIE.2016.083924
Publisher site
See Article on Publisher Site

Abstract

Mild-steel samples were immersed in 0.5 M H2SO4 having different concentrations of Terminalia catappa leaf-extract for investigating inhibition and mechanism of the leaf-extract on mild-steel corrosion in the testenvironment. Corrosion-rate measurements were obtained by potentiodynamic polarisation and gravimetric techniques and analysed for detailing sustainable corrosion-protection by the natural-plant in the test-environment. Results indicate potentiodynamic corrosion-rate correlated excellently (R = 99.25%, Nash-Sutcliffe efficiency (NSE) = 98.52%, ANOVA p-value = 0.0222) with function of the gravimetric corrosion-rate and the leaf-extract concentration. By the experimental and correlated results, inhibition effectiveness on mild-steel corrosion increased with increasing leaf-extract concentration up to the 8 g/L Terminalia catappa leaf-extract, which exhibited optimal inhibition efficiency, = 99.99% (experimental model) or = 95.45% (correlation prediction). Correlation prediction, potentiodynamic and gravimetric data Copyright © 2016 Inderscience Enterprises Ltd. followed the Langmuir and the Flory-Huggins adsorption isotherms with agreements of favourable adsorption/prevalent physisorption mechanism for the leaf-extract corrosion-protection of mild-steel in the test-environment. Keywords: Terminalia catappa; mild steel corrosion; corrosion inhibition; corrosion mechanism; sulphuric-acid environment; potentiodynamic polarisation; gravimetric technique; correlation analysis; adsorption isotherms; sustainable corrosion protection. Reference to this paper should be made as follows: Omotosho, O.A., Okeniyi, J.O., Oni, A.B., Makinwa, T.O., Ajibola, O.B., Fademi, E.O.J., Obi,

Journal

Progress in Industrial Ecology, an International Journal – Inderscience Publishers

Published: Jan 1, 2016

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