Journal
PROGRESS IN ORGANIC COATINGS
Volume 74, Issue 3, Pages 502-510Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2012.01.016
Keywords
Aluminum alloy 3105; Poly(o-anisidine); Electrochemical synthesis; Corrosion; EIS
Funding
- University of Kashan Research Council
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The synthesis of poly(o-anisidine) coatings on aluminum alloy 3105 (AA3105) surface has been investigated by using the galvanostatic method. The synthesized coatings were characterized by reflection absorption infrared (RAIR) spectroscopy. UV-visible absorption spectrometry and scanning electron microscopy (SEM). Optical absorption spectroscopy reveals the formation of the emeraldine form of poly(o-anisidine). The anticorrosion performances of poly(o-anisidine) coatings were investigated in 3.5% NaCl solution by the potentiodynamic polarization technique Tafle and electrochemical impedance spectroscopy (EIS). The corrosion rate of poly(o-anisidine)-coated AA3105 was found similar to 330 times lower than bare AA3105 and potential corrosion increases from -0.85 V versus SCE for uncoated AA3105 to -0.65 V versus SCE for poly(o-anisidine)-coated AA3105 electrodes. The results of this study clearly ascertain that the poly(o-anisidine) has outstanding potential to protect the AA3105 against corrosion in a chloride environment. (C) 2012 Elsevier B.V. All rights reserved.
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