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Effect of Vernonia amygdalina extract and zinc oxide inhibitor on the corrosion of mild steel reinforcement in concrete in 0.2M H2SO4 Environment

Loto, C. A. and Joseph, O. O and Loto, R. T. (2015) Effect of Vernonia amygdalina extract and zinc oxide inhibitor on the corrosion of mild steel reinforcement in concrete in 0.2M H2SO4 Environment. Journal of Chemical and Pharmaceutical Research, 7 (10). pp. 871-881. ISSN 0975-7384

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Abstract

The effect of Vernonia Amygdalina- VA(bitter leaf) extract and zinc oxide (ZnO) inhibitors on the corrosion behaviour of embedded steel rebar in concrete immersed in 0.2% H2SO4 was investigated by potential measurement, pH and gravimetric methods using the inhibitor concentrations of 25, 50, 75, and 100%. The results were further analysed using the two-factor ANOVA test. Potential measurements were performed using a digital voltmeter and a copper sulphate reference electrode. Compressive strength of each block sample was determined after the experiments. Weight loss values were obtained from the gravimetric method, and the inhibitors’ efficiency was computed from the corrosion rate of each of the tested samples. Both inhibitors gave appreciable corrosion inhibition of the embedded steel rebar at 25 and 50% concentrations. ANOVA test confirmed the results at 95% confidence. VA’s concentration had greater effect on potential and pH; ZnO showed great significance in potential measurements only.

Item Type: Article
Uncontrolled Keywords: corrosion; inhibition; Vernonia Amygdalina; zinc oxide; reinforced concrete; sulphuric acid, rebar.
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 13 Oct 2016 14:13
Last Modified: 13 Oct 2016 14:13
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/7321

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