Comparative study of mild steel corrosion using hydrochloric acid and phosphoric acid medium with ocimum tenuiflorum (l) plant extract

Extracts of Ocimum tenuiflorum (l) as organic corrosion inhibitor of mild steel in corrosive media of Phosphoric acid (H3PO4) and hydrochloric acid (HCl) has been investigated at various temperature using gravimetric (weight loss) and spectral techniques. IR and UV–Visible spectral data confirms that the inhibition of corrosion of mild steel occurs through adsorption of the inhibitor molecules. The experimental results reveal that extract of Ocimum Tenuiflorum (l) has a good inhibiting effect on the mild steel tested in both acid solutions. Inhibition efficiency increased with increase in temperature and inhibitor concentration. On Comparison of two acid medium finally 4% Ocimum Tenuiflorum (l) extract is found to be good inhibitor in good inhibition of mild steel corrosion in 0.5 N Phosphoric acids at 93.40% at 328K.