Moringa Oleifera Extract as Green Corrosion Inhibitor for Zinc in Polluted Sodium Chloride Solutions

In this work, moringa extract was examined as a green corrosion inhibitor for zinc in 3.5 % NaCl and 16 ppm solution by using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Results obtained showed that this extract of moringa offered good protection against corrosion of zinc metal and exhibited high inhibition efficiencies. The inhibition efficiency was found to increase with increase in the extract concentration. The adsorption of the inhibitor molecules on the zinc metal surface follows Temkin adsorption isotherm and behaves as mixed type inhibitor.