Corrosion Inhibition of Mild Steel in Tetraoxosulphate (VI) Acid Using Mangifera Indica and Citrus Sinensis Peels Extracts

Abstract

The effects of corrosion and inhibitive effects of two plants peel extracts of mango (Mangifera indica) and orange (Citrus sinensis) were investigated on samples of mild steel immersed in 1 M tetraoxosulphate(VI) acid at ambient temperatures. Statistical probe with ANOVA and Bonferroni-Holm Posthoc Significance Test was used. The inhibitive effect of Mangifera indica and Citrus sinensis peels extracts on mild steel corrosion in H2SO4 solution was studied using weight loss techniques for ten days. The results showed that the inhibition efficiency was found to increase with increasing concentration for both plant peels extracts with concentrations ranging from 0.2 g per litre to 1.0 g per litre of solution. A maximum inhibition efficiency of 50.54 and 50.21% was observed in the concentration of 1.0 g per litre of Mangifera indica and Citrus sinensis peels extracts respectively. Results obtained revealed that corrosion inhibition of mild steel in H2SO4 acid depends on the relative concentration of the inhibitors applied. Mangifera indica peel extracts was slightly more effective against corrosion in 1 M H2SO4 solution for mild steel.