direct electrosynthesis of polyaniline–fe2o3 nanocomposite coating on aluminum alloy 5052 and its corrosion protection performance

the synthesis of polyaniline- fe2o3 nanocomposite coating on aluminum alloy 5052 (aa5052) surface has been investigated by using the galvanostatic method. the anticorrosion performance of polyaniline-fe2o3 coating was investigated in 3.5% nacl solution by the open- circuit potential (ocp), tafel polarization technique and electrochemical impedance spectroscopy (eis). the corrosion rate of polyaniline-fe2o3 nanocomposite coating aa5052 was found about140 times lower than bare aa5052. corrosion potential also decreased from -0.710 v to -0.735 v versus ag/agcl for uncoated aa5052 and polyaniline-fe2o3 nanocomposite coated on aa5052 electrodes, respectively. electrochemical measurements show that polyaniline-fe2o3 nanocomposite coated has good inhibitive properties with pe% of ~97.3% at 25 ma cm-2 current density applied on aa5052 corrosion in a chloride media. the results of this study clearly find out that the polyaniline-fe2o3 nanocomposite has an outstanding possible to protect aa5052 against corrosion in a chloride environment.