Abstract
THE rate of H-2 production was investigated during the dissolution of Zn in 0.5 M HCl in the absence and presence different concentrations of 5-amino-4-imidazolecarboxamide (AIC). Different techniques such as gasometry, electrochemical and scanning electron microscope are used. The data indicated that the rate of hydrogen evolution was increased with the inundation time and temperature and was mitigated with the presence of AIC inhibitor. The electrochemical impedance spectroscopy showed that AIC introduced an inhibitive film that can control the rate of corrosion of zinc. Polarization data indicated that AIC acted as a surface-active molecule that behaves as a mixed-type inhibitor. The free energy of adsorption and adsorption-desorption equilibrium constants were deduced and discussed.