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Thermodynamic Study of Metal Corrosion and Inhibitor Adsorption Processes in Copper/N-1-Naphthylethylenediamine Dihydrochloride Monomethanolate/Nitric Acid System: Part 2

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Tue, 2013-04-09 16:51 — Ismail Warad
Journal Title, Volume, Page: 
Research on Chemical Intermediates, Volume 38, Issue 7, pp 1655-1668
Year of Publication: 
2012
Link: 
http://link.springer.com/content/pdf/10.1007/s11164-012-0492-2
Authors: 
A. Zarrouk
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier, B.P. 717, 60000, Oujda, Morocco
[email protected]
B. Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier, B.P. 717, 60000, Oujda, Morocco
H. Zarrok
Laboratoire des procèdes de séparation, Faculté des Sciences, Université Ibn Tofail, B.P. 242, 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
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
[email protected]
Preferred Abstract (Original): 
N-1-Naphthylethylenediamine dihydrochloride monomethanolate (N-NEDHME) was tested as a corrosion inhibitor for copper in 2 M HNO3 solution using the standard gravimetric technique at 303–343 K. N-NEDHME acts as an inhibitor for copper in an acidic medium. Inhibition efficiency increases with increase in concentration of N-NEDHME but decreases with a rise in temperature. Thermodynamic parameters such as adsorption heat ( \UpdeltaH∘ads ), adsorption entropy ( \UpdeltaS∘ads ) and adsorption free energy (\UpdeltaG∘ads) were obtained from experimental data of the temperature studies of the inhibition process at five temperatures ranging from 303 to 343 K. Kinetic parameters activation such as Ea , \UpdeltaH∘a , \UpdeltaS∘a and pre-exponential factors have been calculated and are discussed. Adsorption of N-NEDHME on the copper surface in 2 M HNO3 follows the Langmuir isotherm model.