Authors: A Zarrouk B Hammouti H Zarrok S S AlDeyab I Warad
Publish Date: 2012/02/01
Volume: 38, Issue: 7, Pages: 1655-1668
Abstract
N1Naphthylethylenediamine dihydrochloride monomethanolate NNEDHME was tested as a corrosion inhibitor for copper in 2 M HNO3 solution using the standard gravimetric technique at 303–343 K NNEDHME acts as an inhibitor for copper in an acidic medium Inhibition efficiency increases with increase in concentration of NNEDHME but decreases with a rise in temperature Thermodynamic parameters such as adsorption heat Updelta H textadscirc adsorption entropy Updelta S textadscirc and adsorption free energy Updelta G textadscirc 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 textacirc Updelta S textacirc and preexponential factors have been calculated and are discussed Adsorption of NNEDHME on the copper surface in 2 M HNO3 follows the Langmuir isotherm model
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