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.
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