Corrosion Inhibition of Zinc in Hydrochloric Acid Solution using some organic compounds as Eco-friendly Inhibitors

Abstract

The effect of some corrosion inhibitors on the corrosion of Zn in 0.5 M HCl have been investigated by using mass loss (ML), potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Polarization data clearly indicated that these compounds behaved as mixed type inhibitors. The effect of temperature on corrosion inhibition has been studied; the thermodynamic activation and adsorption parameters were calculated and discussed. EIS have used to investigate the mechanism of corrosion inhibition. The adsorption of these compounds on Zn was found to obey Langmuir adsorption isotherm. The surface morphology of the Zn specimens was evaluated using scanning electron microscope (SEM), Atomic Force Microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). Quantum chemical calculation was applied to elucidate the adsorption mode of inhibitors molecules onto Zn surface.