Study of Corrosion Inhibitive Behaviour of Moringa Oleifera Leaf Extract on Mild Steel

The inhibiting effect of Moringa oleifera (MO) leaves extract on the corrosion of mild steel in 1.0 M Hydrochloric acid (HCl) has been investigated using gravimetric and electrochemical techniques. Gravimetric study for mild steel presented the best average inhibition at 0.3g/mol concentration, and decreased with increase in concentration. The application reduced weight loss of mild steel from 0.1850g to 0.0095g when inhibited at 0.3 g/mol concentration. Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization (PDP) measurements were also employed in this study. The Nyquist plots of mild steel was determined for different concentrations of Moringa oleifera leaf extract. It confirmed the inhibitive nature of Moringa oleifera leaves extract on the corrosion of mild steel as the corrosion current density decreased with increase in concentration of the extract. Furthermore, the potentiodynamic polarization measurement depicted Moringa oleifera to be a mixed-inhibitor for mild steel. Each technique proved that Moringa oleifera leaves extract is a good inhibitor of mild steel corrosion in acidic medium. Implementation of this research findings will reduce drastically the wastage of mild steel metal products in industries.