African Journal of Pure and Applied Chemistry
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Article Number - 22BA17440713


Vol.7(10), pp. 337-349 , October 2013
DOI: 10.5897/AJPAC2013.0520
ISSN: 1996-0840



Full Length Research Paper

Eco-friendly chalcones derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solution


A. S. Fouda1*, M. A. Elmorsi2 and A. Elmekkawy1




 

1Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura-35516, Egypt.

2Department of Chemistry, Faculty of Science, Tanta University, Tanta- 31511, Egypt.


Email: asfouda@mans.edu.eg






 Accepted: 18 September 2013  Published: 31 October 2013

Copyright © 2013 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


 

The inhibiting effect of some chalcones derivatives on the corrosion of carbon steel in 1 M HCl was studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The results showed that the inhibition efficiency increases with increasing the inhibitor concentration, while it decreases with increasing the temperature. The adsorption of chalcones derivatives on the carbon steel surface obeys Langmuir adsorption isotherm. Some thermodynamic parameters were calculated and discussed. The values of free energy of adsorption for investigated inhibitors were calculated. Polarization curves showed that chalcones derivatives are mixed-type inhibitors but the cathode is more polarized than the anode. The variation in inhibition efficiency depends on the type of the substituent groups in the benzene ring. It was found that the presence of donating group (such as OCH3) better facilitates the adsorption of molecules on the surface than in the case with withdrawing groups (such as – Cl and NO2). The data obtained from the four different methods were in good agreement.

 

Key words: Carbon steel, HCl, corrosion inhibition, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), chalcones derivatives.

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APA (2013). Eco-friendly chalcones derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solution. African Journal of Pure and Applied Chemistry, 7(10), 337-349.
Chicago A. S. Fouda, M. A. Elmorsi and A. Elmekkawy. "Eco-friendly chalcones derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solution." African Journal of Pure and Applied Chemistry 7, no. 10 (2013): 337-349.
MLA A. S. Fouda, M. A. Elmorsi and A. Elmekkawy. "Eco-friendly chalcones derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solution." African Journal of Pure and Applied Chemistry 7.10 (2013): 337-349.
   
DOI 10.5897/AJPAC2013.0520
URL http://academicjournals.org/journal/AJPAC/article-abstract/22BA17440713

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