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Inhibitive Properties and Thermodynamic Characterization of Quinoxaline Derivative on Carbon Steel Corrosion in Acidic Medium

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Tue, 2013-04-30 07:41 — Ismail Warad
Journal Title, Volume, Page: 
Der Pharmacia Lettre, 2013, 5 (2):43-53
Year of Publication: 
2013
Link: 
http://scholarsresearchlibrary.com/dpl-vol5-iss2/DPL-2013-5-2-43-53.pdf
Authors: 
H. Zarrok
Laboratoire des procèdes de séparation, Faculté des Sciences, Université Ibn Tofail, Kénitra, Morocco
A. Zarrouk
LCAE-URAC18, Faculté des Sciences, Université Mohammed 1 er, Oujda, Morocco
R. Salghi
Equipe de Génie de l’Environnement et Biotechnologie, ENSA, Université Ibn Zohr, BP1136 Agadir, Morocco
M. Assouag
Laboratoire des procèdes de séparation, Faculté des Sciences, Université Ibn Tofail, Kénitra, Morocco
B. Hammouti
H. Oudda
Laboratoire des procèdes de séparation, Faculté des Sciences, Université Ibn Tofail, Kénitra, Morocco
S. Boukhris
Laboratoire de Synthèse Organique, Organométallique et Théorique, Faculté des Sciences, Université Ibn Tofail, B.P. 133, 14000 Kenitra, Morocco
S. S. Al Deyab
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
I. Warad
Department of Chemistry, Science College. AN-Najah National University, P. O. Box 7, Nablus, State of Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
[email protected]
Preferred Abstract (Original): 
The inhibition of ethyl 2-(4-(2-ethoxy-2-oxoethyl)-2-p-tolylquinoxalin-1(4H)-yl) acetate (Q3) on the corrosion of carbon steel in 1.0 M HCl at 308-343 K was studied by gravimetric method. Results obtained show that Q3 acts as inhibitor for carbon steel in hydrochloric solution. The inhibition efficiency was found to increase with increase in Q3 but decreased with temperature, which is suggestive of physical adsorption mechanism although chemisorption may play a part. The adsorption of Q3 onto the carbon steel surface was found to follow the Langmuir adsorption isotherm. Both kinetic parameters (activation energy, pre-exponential factor, enthalpy of activation and entropy of activation) and thermodynamics of adsorption (enthalpy of adsorption, entropy of adsorption and Gibbs free energy) were calculated and discussed.
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