Electrochemical, Spectrochemical and Quantum Chemical Studies on Dimedone as Corrosion Inhibitor for Copper in Acetonitrile | Chapter 09 | Advances in Applied Science and Technology Vol. 3
A number of techniques have been applied in the investigation of inhibition abilities of dimedone (DMD) for copper in acetonitrile at 25°C. By potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), the corrosion resistance was found to be increased with inhibitor concentration up to 93.68% inhibition efficiency at 3.00 mM, indicating that DMD molecules can cumulatively adsorb on the copper surface and finally form a protective film on copper-solution interface. This is also supported by the decreasing of copper oxidation in cyclic voltammogram. Polarization curves revealed that DMD is of mixed type inhibitor. The adsorption of DMD on copper surface obeys the Langmuir isotherm and the adsorption mechanism is of physisorption type. The values of standard energy of adsorption (∆G o ads ) were found to be in good agreement for both polarization and impedance techniques to be -8.17 and -8.43 kJmol -1 respectively. Fourier Transform Infrared spectroscopy (F...