electrosynthesis of polyaniline-tio2 nanocomposite films on aluminum alloy 3004 surface and its corrosion protection performance

the direct synthesis of polyaniline-tio2 nanocomposite coatings on aluminum alloy 3004 (aa3004) surface has been investigated by using the galvanostatic method. the synthesized coatings were characterized by ft-ir, sem-edx, sem and afm. optical absorption spectroscopy reveals the formation of the emeraldine oxidation state form of polyaniline-tio2 nanocomposite. the corrosion performances of polyaniline-tio2 nanocomposite coatings were investigated in 3.5% nacl solution by tafel polarization and electrochemical impedance spectroscopy (eis) methods. the corrosion rate of polyaniline-tio2 nanocomposite coating on aa3004 was found ∼260 times lower than bare aa3004 and corrosion potentials of these coatings have shifted to more positive potentials (105 mv). the results of this study clearly ascertain that the polyaniline-tio2 nanocomposite coating has outstanding potential to protect the aa3004 against corrosion in a chloride environment.