Corrosion Inhibition Efficiency of Bio Waste on Mild Steel in Acid Media

The inhibitive action of alkali extract human hair extract (Bio waste) against the corrosion of mild steel (98.58%) in solutions of nitric acid has been studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). At inhibitor concentration range (0.004 % v/v to 0.1% v/v) in 0.3 M HNO3 acid, the results showed that these compounds suppressed both cathodic and anodic processes of mild steel corrosion in 0.3 M HNO3 by adsorption on the mild steel surface. The efficiency of the inhibitor in both potentiodynamic and EIS measurements reveal that these compounds inhibit the mild steel corrosion in 0.3 M HNO3 and that the efficiency increases with increasing of the inhibitor concentration. Scanning electron microscopy (SEM) study confirmed that the inhibition of corrosion of mild steel is through adsorption of the extract molecules on surface of metal.