Adsorption and inhibitive properties of camellia sinensis for mild steel in 0.5M HCl and 0.8M H2SO4

Loto, Cleophas Akintoye and Joseph, O. O and Loto, C. A. and Okeniyi, Joshua Olusegun (2015) Adsorption and inhibitive properties of camellia sinensis for mild steel in 0.5M HCl and 0.8M H2SO4. NACE - International Corrosion Conference Series, 2015 (5655). pp. 1-15. ISSN 3614409

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Abstract

The effect of Camellia Sinensis (green tea) extract as a 'green' inhibitor on mild steel corrosion in 0.5M HCl and 0.8M H2SO4 was studied at ambient temperature. Weight loss/corrosion rate and potential measurement techniques were used for the experimental work. The results were further analyzed using the two-factor ANOVA. Potential measurement was performed using a digital voltmeter and a saturated calomel reference electrode. Results obtained showed effective corrosion-inhibition of the extract on the mild steel test-specimens in the different concentrations of HCl and H2SO4 used. There was increasing inhibition performance with increasing concentration of inhibitor. In 0.5M HCl, 100 green tea gave the optimal performance with weight loss and corrosion rate of 246mg and 0.63 mm/yr respectively. A similar result was observed in 0.8M H2SO4 where 100 green tea gave the best results of 1226 mg weight loss and 3 mm/yr corrosion rate. ANOVA test confirmed the results at 95 confidence, and further showed that concentration of green tea extract had greater effect on potential and weight loss measurements. The Gibb's free adsorption energy signified physisorption in HCl and chemisorption in H2SO4 as the adsorption mechanism of plant extract molecules on the metal surface. © 2015 by Nace International.

Item Type:	Article
Additional Information:	Conference of Corrosion 2015: Collaborate. Educate. Innovate. Mitigate. ; Conference Date: 15 March 2015 Through 19 March 2015; Conference Code:113704
Uncontrolled Keywords:	Adsorption; Analysis of variance (ANOVA); Carbon steel; Corrosion; Corrosion inhibitors; Free energy; Physisorption; Plant extracts; Steel, Adsorption mechanism; Camellia sinensis; Corrosion inhibition; Inhibition performance; Inhibitive properties; Potential measurements; Saturated calomel reference electrodes; Weight loss measurements, Corrosion rate
Subjects:	Q Science > Q Science (General) Q Science > QA Mathematics Q Science > QC Physics Q Science > QD Chemistry S Agriculture > S Agriculture (General) T Technology > T Technology (General) T Technology > TD Environmental technology. Sanitary engineering T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Dr Joshua Olusegun Okeniyi
Date Deposited:	15 Aug 2016 15:06
Last Modified:	31 Oct 2018 11:17
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/6891

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