Omotosho, Olugbenga Adeshola and Okeniyi, Joshua Olusegun and Oni, Adeoluwa Barnabas and Makinwa, Thomas Oluwafemi and Ajibola, Omokolade Bamidele and Fademi, Ekundayo Oluwademilade Jacob and Obi, Chukwunonso Ezekiel and Loto, C. A. and Popoola, Abimbola Patricia Idowu (2016) Inhibition and mechanism of Terminalia catappa on mild-steel corrosion in sulphuric-acid environment. Progress in Industrial Ecology, An International Journal, 10 (4). pp. 398-413. ISSN 1476-8917
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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, η = 99.99% (experimental model) or η = 95.45% (correlation prediction). Correlation prediction, potentiodynamic and gravimetric data 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.
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