51315-5655-Adsorption and Inhibitive Properties of Camellia Sinensis for Mild Steel in 0.5M HCl and 0.8M H?SO?

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Product Number: 51315-5655-SG

ISBN: 5655 2015 CP

Author: Loto Akintoye

Publication Date: 2015

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The effect of Camellia Sinensis (green tea) extract as an organic ‘green’ inhibitor on the corrosion of mild steel 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 test. Potential measurement was performed using a digital voltmeter and a saturated calomel reference electrode. The tea extract was obtained from the green tea leaves. The results obtained showed effective corrosion inhibition of the extract on the mild steel test specimens in the different concentrations of hydrochloric acid and sulphuric acid used. The extracts gave appreciable corrosion inhibition performance of mild steel at all inhibitor concentrations used. There was increasing inhibitor performance with increasing concentration of inhibitor. In 0.5M HCL the optimal performance obtained with 100% green tea by means of weight loss and corrosion rate was 246mg and 0.00063 x103 mg respectively. A similar result was observed for 0.8M H2SO4 where 100% green tea gave the best results of 1.226 x 103 mg and 0.003 x103 mg for weight loss and corrosion rates respectively. 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 value of Gibb’s free energy of adsorption obtained signified that the mechanism of adsorption of plant extract molecules on the metal surface in both environments was by physiosorption.