# Thermodynamic study of metal corrosion and inhibitor adsorption processes in copper/N-1-naphthylethylenediamine dihydrochloride monomethanolate/nitric acid system: part 2

Thermodynamic study of metal corrosion and inhibitor adsorption processes in... 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 ( $$\Updelta H_{\text{ads}}^\circ$$ ), adsorption entropy ( $$\Updelta S_{\text{ads}}^\circ$$ ) and adsorption free energy ( $$\Updelta G_{\text{ads}}^\circ$$ ) 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 $$E_{a}$$ , $$\Updelta H_{\text{a}}^\circ$$ , $$\Updelta S_{\text{a}}^\circ$$ 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

# Thermodynamic study of metal corrosion and inhibitor adsorption processes in copper/N-1-naphthylethylenediamine dihydrochloride monomethanolate/nitric acid system: part 2

, Volume 38 (7) – Feb 1, 2012
14 pages

Publisher
Springer Journals
Subject
Chemistry; Inorganic Chemistry; Catalysis; Physical Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0492-2
Publisher site
See Article on Publisher Site

### Abstract

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 ( $$\Updelta H_{\text{ads}}^\circ$$ ), adsorption entropy ( $$\Updelta S_{\text{ads}}^\circ$$ ) and adsorption free energy ( $$\Updelta G_{\text{ads}}^\circ$$ ) 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 $$E_{a}$$ , $$\Updelta H_{\text{a}}^\circ$$ , $$\Updelta S_{\text{a}}^\circ$$ 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.

### Journal

Research on Chemical IntermediatesSpringer Journals

Published: Feb 1, 2012

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