Mitigation of Hydrogen Evolution during Zinc Corrosion in Aqueous Acidic Media Using 5-Amino-4-imidazolecarboxamide

Document Type : Original Article

Authors

1 Zagazig University, Chemistry Department, Faculty of Science, Egypt

2 Tabuk Uinversity, Faculty of Science, Chemistry Departement

3 Tabuk University, Faculty of Science

4 Chemistry Administration, Cairo, Egypt

Abstract

The rate of H2 production was investigated during the dissolution of Zn in 0.5 M HCl in the absence and presence different concentrations of 5-amino-4-imidazole carboxamide (AIC). Different techniques such as gasometry, potentiodynamic, impedance and scanning electron microscope were used. The data indicated that the rate of hydrogen evolution was increased with the inundation time and temperature and was mitigated by AIC inhibitor. The potentiodynamic polarization and electrochemical impedance spectroscopy showed that AIC introduces an inhibitive film that can control the corrosion of zinc and the production of H2. Polarization data proved that AIC inhibitor acted as a surface-active molecule that behaves as a mixed-type inhibitor. The free energy of adsorption and adsorption-desorption equilibrium constant were deduced and discussed.

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History

  • Receive Date: 31 October 2018
  • Revise Date: 18 December 2018
  • Accept Date: 20 December 2018

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