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Inhibition of copper corrosion in acid solution by N-1-naphthylethylenediamine dihydrochloride monomethanolate: experimental and theoretical study: part-1 |
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| Authors: | A Zarrouk B Hammouti A Dafali H Zarrok R Touzani M Bouachrine M Zertoubi |
| Institution: | 1. LCAE-URAC18, Facult?? des Sciences, Universit?? Mohammed Premier, Oujda, Morocco 2. Laboratoire des Proc??des de S??paration, Facult?? des Sciences, Universit?? Ibn Tofail, Kenitra, Morocco 3. Facult?? Pluridisciplinaire de Nador, Universit?? Mohammed Premier, B.P. 300, 62700, Selouane, Nador, Morocco 4. UMIM, Facult?? Polydisciplinaire de Taza, Universit?? Sidi Mohamed Ben Abdellah, Taza, Morocco 5. LEMI, Facult?? des Sciences Ain Chock, Universit?? Hassan II, B.P. 5366, Maarif Casablanca, Morocco |
| Abstract: | Inhibition of corrosion of copper in 2M HNO3 by N-1-naphthylethylenediamine dihydrochloride monomethanolate (N-NEDHME) has been studied by use of weight loss, electrochemical polarization, and electrochemical impedance spectroscopy (EIS) measurements. The result obtained reveal that this organic compound is a very good inhibitor and its inhibition efficiency increases with increasing concentration, reaching 94% at 10?3?M at 303?K. The potentiodynamic polarization study indicated that this compound acts as a cathodic type corrosion inhibitor. EIS results indicate that the change in the impedance properties (R t and C dl) with concentration of inhibitor was because of the formation of a protective layer on the surface of copper. Quantum chemical calculations using DFT at the B3LYP/6-31G* level of theory was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of N-NEDHME. The effect of temperature between 303 and 343?K and calculation of activation data will be discussed in Part 2. |
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