African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 357

Full Length Research Paper

Quinazolin derivatives as eco-friendly corrosion inhibitors for low carbon steel in 2 M HCl solutions

A. S. Fouda
  • A. S. Fouda
  • Department of Chemistry, Faculty of Science, El -Mansoura University, El-Mansoura-35516, Egypt
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G. Y. Elewady
  • G. Y. Elewady
  • Department of Chemistry, Faculty of Science, El -Mansoura University, El-Mansoura-35516, Egypt
  • Google Scholar
H. A. Mostafa
  • H. A. Mostafa
  • Department of Chemistry, Faculty of Science, El -Mansoura University, El-Mansoura-35516, Egypt
  • Google Scholar
S. Habbouba
  • S. Habbouba
  • Department of Chemistry, Faculty of Science, El -Mansoura University, El-Mansoura-35516, Egypt
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  •  Accepted: 13 May 2013
  •  Published: 31 May 2013

Abstract

Some quinazoline derivatives such as: 3-(4-chlorophenyl)-2-methylquinazolin-4(3H)-one (CMQ) and 2-methyl-3-(4-nitrophenyl) quinazolin-4(3H)-one (MNQ) were investigated as corrosion inhibitors for carbon steel in 2 M HCl solution. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, electrochemical frequency modulation and weight loss methods were used to study the inhibition action at 30°C. The corrosion of steel was controlled by a charge transfer process at the prevailing conditions. The electrochemical results showed that these compounds are efficient inhibitors for carbon steel and efficiency up to 93.8% was obtained at 30°C. The inhibition efficiency increases with inhibitor concentration. The adsorption of these compounds on carbon steel surface follows the Langmuir adsorption isotherm. Polarization curves indicate that investigated quinazoline derivatives are mixed-type inhibitors. The chemical and electrochemical methods gave similar results. 

 

Key words: Corrosion inhibitors, hydrogen acid (HCl), carbon steel, quinazoline derivatives.