Corrosion inhibition study of mild steel in hydrochloric acid using Citrus sinensis and Mangifera indica peel extracts

摘要

The effects of corrosion and the inhibitive effects of plants extract were investigated on samples of mild steel immersed in Hydrochloric acid. Findings have shown that inorganic chemicals used to inhibit corrosion of some organic material, are also suitable for corrosion inhibition of metals and their alloys. Extracts of mango and sweet orange were investigated for their inhibitive effects. In this study, corrosion inhibition of mild steel coupons was carried out on 1.0M solution of hydrochloric acid media through the application of mango peel extract (Mangifera indica) and orange peels extract (Citrus sinensis) which are organic materials. The method of mass loss test experiment was employed for ten days, at room temperature. Energy dispersed x-ray spectrometer (EDX 3600B) was used to analyze a coupon of the mild steel used before the commencement of the experiment. The results confirm that mango (Mangifera indica) is capable of inhibiting corrosion of steel in inorganic acids. The results further show that inhibition by the inhibitors of steel in inorganic acid environment depends on the relative concentration of the inhibitors applied. For example, 1.0 g per litre of each of the inhibitors inhibits better than 0.2 g per litre of same. Mango peel extract has proved to be slightly more effective in HCl solution for mild steel inhibition as revealed by the results.