Effect of Vernonia amygdalina extract and zinc oxide inhibitor on the corrosion of mild steel reinforcement in concrete in 0.2M H2SO4 Environment
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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.
Keywords
T Technology (General), TJ Mechanical engineering and machinery