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

در اين مقاله نانوكامپوزيت پلي آنيلين-Fe2O3 پوشش داده شده بر روي آلياژآلومينيوم5052 با استفاده از روش گالوانوستاتيك بررسي شد. كارايي ضدخوردگي نانوكامپوزيت در 3.5 درصد NaCl با پتانسيل مدار باز ، تكنيك پلاريزاسيون تافل و اسپكتروسكوپي امپدانس الكتروشيميايي بررسي شد. به هنگام استفاده از نانوكامپوزيت پلي آنيلين-Fe2O3سرعت خوردگي 140 برابر كاهش مي يابد. نتايح اين تحقيق به خوبي نشان مي دهد كه مي توان از اين نانوكامپوزيت براي محافظت از آلياژ آلومينيوم 5052 در محيط NaCl استفاده كرد.

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.