Direct Electrosynthesis of Polyaniline–Fe2O3 Nanocomposite Coating on Aluminum Alloy 5052 and Its Corrosion Protection Performance

Document Type: Research Paper

Authors

Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R. Iran.

10.7508/jns.2015.04.014

Abstract

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.

Keywords


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