Abstract
In this study, 3-octylthiophene (3OT) and its nanocomposites with TiO2(3OT/TiO2) were electrochemically synthesized in different initial monomer concentrations (50, 75, 100, and 150 mM) in 0.1 M tetraethylammonium tetrafluoroborate (TEABF4)/acetonitrile (CH3CN) on a glassy carbon electrode (GCE). The best modified electrodes, which were taken from the optimum conditions of redox behaviors, were also electropolymerized in 0.5 M oxalic acid/acetonitrile (CH3CN) solution on Al1050 electrode. The modified Al1050 electrodes were characterized by optical microscope, FTIR-ATR, SEM-EDX, and EIS. The optimum conditions of the electrocoated P(3OT)/Al1050 and P(3OT)/TiO2 nanocomposites on Al1050 electrode were investigated for corrosion performances against 3.5% NaCl solution. The corrosion tests were performed by EIS and Tafel extrapolation plots together with the equivalent circuit model of Rs(Qc(Rc(QpRct))). P(3OT)/TiO2 nanocomposite films showed higher protection efficiency (PE = 89%) than P(3OT) films (PE = 81%). The P(3OT)/TiO2 nanocomposite films coated on Al1050 electrodes may be used in industrial applications of corrosion protection against salt water.
ACKNOWLEDGMENTS
The authors thank Serhat Tikiz (Afyon Kocatepe Univ., TUAM, Afyon, Turkey) for SEM-EDX measurements and Dr. Argun Gokceoren (ITU, Istanbul, Turkey) for FTIR-ATR measurements. The authors also wish to thank the ASM Elexol Aluminum Company (Istanbul, Turkey) for providing Al1050 electrodes.
Notes
Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/lpte.