An evaluation of expired Naftifine drug act as nontoxic corrosion inhibitor for copper in 5 M HCl solution was evaluated by weight loss (mass loss), Tafel plots and AC impedance spectroscopy techniques. The chemical and electrochemical results were complemented by scanning electron microscopy (SEM) techniques. Weight loss studies shows that, increases in the concentration of the expired Naftifine drug enhance the protection rate of copper metal in acidic environment, but decreases with rise in the immersion period. Tafel plots show the mixed corrosion inhibition role of expired Naftifine drug over the surface of copper. Further, AC impedance plots and SEM topography shows the adsorption property of expired Naftifine drug on the surface of copper.

Keywords: Expired Naftifine Drug; Weight Loss; Tafel Plot;