Electrochemical synthesis and corrosion properties of polyaniline coating on aluminum

Electrochemical polymerization of Polyaniline (PANI) film on aluminum electrode from aqueous solution of 0.20 mol dm-3 sodium benzoate containing 0.25 mol dm-3 aniline have been investigated using potentiodinamic and galvanostatic techniques. Corrosion behavior of aluminum and PANI coated aluminum electrode during initial exposure to 3% NaCl have been investigated using electrochemical potentiodimanic and impedance spectroscopy technique (EIS). It was observed that thin PANI coating of estimated thickness of 10μm had provided good initial corrosion protection of aluminum in3% NaCl, decreasing the corrosion current density at least 15 times