Research on Chemical Intermediates

, Volume 39, Issue 6, pp 2417–2433 | Cite as

Inhibiting effects of benzamide derivatives on the corrosion of mild steel in hydrochloric acid solution

  • M. Elbakri
  • R. Touir
  • M. Ebn Touhami
  • A. Zarrouk
  • Y. Aouine
  • M. Sfaira
  • M. Bouachrine
  • A. Alami
  • A. El Hallaoui


The inhibition effect of new heterocyclic compounds, namely N-(cyanomethyl)benzamide (BENZA) and N-[(1H-tetrazol-5-yl)methyl]benzamide (BENZA-TET), on mild steel corrosion 1 M HCl was investigated using electrochemical measurements. The results indicated that the inhibition efficiency depends on concentration, immersion time and temperature. The BENZA is a better inhibitor than BENZA-TET. Polarization measurements showed that the inhibitor BENZA-TET is a cathodic type, but BENZA acts as a mixed type inhibitor. In addition, the changes in impedance parameters indicated that these compounds adsorbed on the metal surface leading to the formation of a protective film. Adsorption of benzamide derivatives on the mild steel surface was investigated to consider basic information on the interaction between the inhibitors and the metal surface. It was found to obey the Langmuir adsorption isotherm. From the temperature dependence, the activation energy in the presence of (BENZA) was found to be inferior to that in uninhibited medium. In order to explain why BENZA is the most efficient inhibitor, quantum chemical calculations were applied. The relationships between quantum chemical parameters and corrosion inhibition efficiency have been discussed to see if there is any correlation between them.


Mild steel HCl Corrosion Benzamide derivatives Polarization EIS DFT 


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • M. Elbakri
    • 1
  • R. Touir
    • 1
  • M. Ebn Touhami
    • 1
  • A. Zarrouk
    • 2
  • Y. Aouine
    • 3
  • M. Sfaira
    • 4
  • M. Bouachrine
    • 5
  • A. Alami
    • 3
  • A. El Hallaoui
    • 3
  1. 1.Faculty of Science, Materials, Electrochemical and Environment LaboratoryUniversity Ibn TofailKenitraMorocco
  2. 2.Faculty of Science, LCAE-URAC18Mohammed First UniversityOujdaMorocco
  3. 3.Faculty of Sciences Dhar El Mahraz, Laboratory of Organic ChemistrySidi Mohammed Ben Abdellah UniversityFezMorocco
  4. 4.Faculty of Sciences Dhar El Mahraz, Laboratory of Materials Engineering, Modelling and EnvironmentSidi Mohammed Ben Abdellah UniversityFezMorocco
  5. 5.Faculty Polydisciplinary of Taza, UMIMSidi Mohammed Ben Abdellah UniversityTazaMorocco

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