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Inhibition Effect of Zinc Oxide on the Electrochemical Corrosion of Mild Steel Reinforced Concrete in 0.2M H2SO4

Loto, C. A. and Joseph, O. O and Loto, R. T. (2016) Inhibition Effect of Zinc Oxide on the Electrochemical Corrosion of Mild Steel Reinforced Concrete in 0.2M H2SO4. J. Mater. Environ. Sci., 7 (3). pp. 915-925. ISSN 2028-2508

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The inhibition effect of zinc oxide on the corrosion behaviour of embedded mild steel rebar in concrete has been investigated by potential measurement, such as pH and gravimetric (weight loss) methods. The results were further analysed using the two-factor ANOVA test. The experiments were performed using zinc oxide as an organic inhibitor in 0.2M H2SO4 solution. Inhibitor concentrations of 25, 50 75, and 100% were prepared from 200g of ZnO powder, with distilled water. Potential measurements were taken using a digital voltmeter and a copper-copper sulphate electrode as the reference electrode. Compressive strength of each block sample was determined after the experiments. Weight loss values were obtained from the gravimetric method and the inhibitor efficiency was computed from the corrosion rate of each of the tested samples. Results showed that varied concentration of ZnO inhibitor and the test exposure time significantly affect both the corrosion potential of embedded steel rebar in concrete and the pH of the medium. The outcome of the ANOVA test confirmed the results at 95% confidence, and further showed that concentration of ZnO had greater effect on potential and pH measurements. Zinc Oxide inhibitor performed effectively as an inhibition agent to the corrosion of the embedded steel rebar in concrete at 25% and 50% concentrations in 0.2M H2SO4 test medium. The highest inhibition efficiency was achieved at 25% concentration, the lowest inhibitor concentration used.

Item Type: Article
Uncontrolled Keywords: Corrosion; Inhibition; Zinc Oxide; Reinforced Concrete; sulphuric acid
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: 18 Oct 2016 10:31
Last Modified: 18 Oct 2016 10:31

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