Abstract
Chronoamperometry was used to deposit polyaniline (Pani) films onto AA2024-T3 aluminum alloy from a sulphuric acid electrolyte. Electropolymerization parameters of 1.00VSCE and 17min produced a Pani coating with the highest protection ability in 0.5M NaCl solution. Structure and morphology of the coating were characterized by scanning electron microscopy (SEM) and infrared spectroscopy under reflectance mode (FTIR-ATR) analysis. Electrochemical impedance spectroscopy (EIS) was applied to access the physical proprieties and the anticorrosion performance of Pani in 0.5M NaCl solution. Impedance spectra, collected at open circuit potential (OCP), exhibited, at high frequencies, a CPE contribution related to inhomogeneous water uptake in the coating which was analyzed by normal power-law distributions of the local resistivity and permittivity of coating. Finally, the Pani anticorrosion performance was discussed.
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