Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry
ISSN: 0975-413X
Abstract
N-containing organic compound As An Effective Corrosion Inhibitor For Copper In 2M HNO3 : Weight Loss and Quantum Chemical Study
Author(s): A. Zarrouk, B. Hammouti, H. Zarrok, I. Warad, M. Bouachrine(2Z)-1-(4-chlorophenyl)-2-[(3E)-3-[2-(4-chlorophenyl)-2-oxoethylidene]-3,4dihydro quinoxalin- 2 (1H)-ylidene]ethanone (Q4) was tested as inhibitor for the corrosion of copper in 2M HNO3 using gravimetric method at 303 – 343 K. The inhibitor (Q4) showed about 90% inhibition efficiency (E (%)) at an optimum concentration of 10-3M. The inhibition efficiency increases with increase in inhibitor concentration but decrease with rise in temperature. Various parameters (Ea, DG° ads, Kads) for adsorption reveal a strong interaction between inhibitor and copper surface. The negative values of DG° ads indicate the spontaneous adsorption of the inhibitor on copper surface. Kinetic parameters activation such as Ea , DHa° , a DS° and pre-exponential factor have been calculated and discussed. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.
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