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: 368

Full Length Research Paper

Azodyes as corrosion inhibitors for dissolution of C-steel in hydrochloric acid solution

M. Abdallah1, A. S. Fouda2, S. A. Shama1 and E. A. Afifi1
1Chemistry Department, Faculty of Science, Benha University, Benha, Egypt. 2Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Email: [email protected]

  •  Accepted: 24 September 2008
  •  Published: 30 September 2008

Abstract

The effect of some mono azo dye compounds on the dissolution of carbon steel (type L-52) in 2M hydrochloric acid solution was studied using weight loss and galvanostatic polarization techniques. The inhibition efficiency was found to increase with increasing inhibitor concentration and decreasing temperatures. Inhibition was explained by formation of insoluble complex adsorbed on the metal surface. The adsorption follows Langmuir adsorption isotherm. The formation of stable complex was studied by conductometric titration. The stiochiometric ratio was found to be 1:1; 1:2 for Fe2+/ dye compounds and the mechanism of inhibition was explained in terms of these values. The thermodynamic functions of adsorption process was calculated and discussed.

 

Key words: Carbon steel, corrosion inhibitors, azo dyes, adsorption.

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This article is published under the terms of the Creative Commons Attribution License 4.0

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