Electropolymerization of p-phenylenediamine (pPD) on Pt-electrode from a deoxygenated aqueous acid medium was carried out using cyclic voltammetry technique. The kinetic parameters were calculated by means of electrochemical data. The experimentally obtained kinetic equation was1.23 [acid] 1.24 [electrolyte] 0.94 from the value of the anodic current density. The apparent activation energy (E a ) is found to be 65.1 kJ mol À1. The obtained polymer films have been characterized by X-ray diffraction, elemental analysis, scanning electron microscopy, UV-vis, and IR spectroscopy. The conductivity of the polymer pellets is 6.3 Â 10 À7 S cmÀ1 . The mechanism of the electrochemical polymerization reaction has been discussed. TGA is used to confirm the proposed structure and determination of the number of water molecules in the polymeric chain unit. V C 2010Wiley Periodicals, Inc. J Appl Polym Sci 117: [943][944][945][946][947][948][949][950][951][952] 2010

Electropolymerization of O-phenylenediamine (o-PD) on Pt-electrode from a deoxygenated aqueous acid medium was carried out using cyclic voltammetry technique. The kinetic parameters were calculated by means of electrochemical data. The experimentally obtained kinetic equation1.19 [acid] 1.23 [electrolyte] 0.87 from the value of the anodic current density using cyclic voltammetry technique. The apparent activation energy (E a ) is found to be 28.34 kJ mol C-NMR, UV-visible, and IR spectroscopy. The mechanism of the electrochemical polymerization reaction has been discussed. TGA is used to confirm the proposed structure and determination of the number of water molecules in the polymeric chain unit.

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Corrosion inhibition of mild steel in hydrochloric acid solutions using electropolymerized Poly 2-aminobenzothiazole, P(2ABT), was evaluated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy measurements at different temperature. Results showed that the inhibition efficiency increases with increasing the concentration of P(2ABT) up to 12.7 9 10 -6 mol L -1 and decreases with raising the temperature. Polarization curves indicate that the studied compound acts as anodic inhibitor. Thermodynamic activation parameters for both dissolution and adsorption processes are calculated and discussed as well as the adsorption isotherms are calculated. Gibbs free energy value confirms the physical nature of the adsorption, also the mechanism of inhibition is discussed. Scanning electron microscopy is used to study the surface morphology of mild steel in hydrochloric acid solution in the absence and presence of 12.7 9 10 -6 mol L -1 P(2ABT). Data obtained from all techniques are in a good agreement with each other.