Abstract
Megavit zinc drugs is a physical and mental activity enhancer it is so dangerous to be left in the environment after its expired as it is harmful to the child's, so the present work introduces an idea for using it in the expired medicinal form as potential nontoxic inhibitor for steel corrosion against acidic 1.0 M HCl. The electrochemical techniques were applied in the evaluation of inhibition efficiency of megavit drugs in the expired form. Effect of expired drug concentration and reaction temperature were studied. The corrosion inhibition was found to increase by increasing concentration and decreased with rising the temperature. Potentiodynamic polarization data show that the expired drugs retard both anodic and cathodic potential meaning it is a mixed inhibitor. The electrochemical impedance spectroscopy EIS, techniques data shows that the expired drug help to increases the polarization resistance by adsorbing on metal/electrolyte interface. This kind of adsorption found to obeying Langmuir adsorption isotherm model. The data obtained from the used electrochemical techniques exhibit good agreement between them with (+/- 2) to prove that the used expired megavit zinc medicinal drugs act as green corrosion inhibitor for the c-steel in 1.0 M HCl acidic environment and in an industrial field.