Yazar "Kalender, Okan" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Comparison of anticorrosion behavior of polyaniline and poly(3,4-methylenedioxyaniline) and their titanium dioxide nanocomposites
    (Sage Publications Ltd, 2015) Ateş, Murat; Kalender, Okan
    In this study, polyaniline (PANI) and poly(3,4-methylenedioxyaniline) (P(MDAN)) nanocomposites with titanium dioxide (TiO2) nanoparticles were investigated on Al1050 electrodes. Aniline (ANI), MDAN, ANI/TiO2, and MDAN/TiO2 nanocomposites were successfully electropolymerized by the chronoamperometric method. The modified films were characterized by different techniques such as scanning electron microscopy (SEM), Fourier transform infrared-attenuated transmission reflectance, and electrochemical impedance spectroscopy (EIS). The surfaces of modified electrodes were observed by SEM and an optical microscope with a camera. Anticorrosion behaviors of PANI, PANI/TiO2, P(MDAN), and P(MDAN)/TiO2 films were measured in 3.5% sodium chloride solution by Tafel extrapolation and EIS techniques. PANI, PANI/TiO2, P(MDAN), and P(MDAN)/TiO2 film electrodes increased the corrosion resistance of the film as compared to the uncoated Al1050 substrate. Therefore, the highest protection efficiency of 97.2% was obtained for PANI/TiO2 film. The corrosion resistance values of PANI, PANI/TiO2, P(MDAN), and P(MDAN)/TiO2 films were increased significantly compared with the uncoated Al1050 electrode.
  • Küçük Resim
    Öğe
    Polyaniline and polypyrrole/TiO2 nanocomposite coatings on Al1050: electrosynthesis, characterization and their corrosion protection ability in saltwater media
    (Springer, 2015) Ateş, Murat; Kalender, Okan; Topkaya, Erhan; Kamer, Levent
    Polyaniline (PANI), polypyrrole (PPy) nanofilms, PANI/TiO2 and PPy/TiO2 nanocomposites were synthesized electrochemically on Al1050 electrode. The formation of PANI and PPy nanofilms and PANI/TiO2 and PPy/TiO2 nanocomposites was characterized by Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), UV-visible absorption spectroscopy (UV-Vis), scanning electron microscopy (SEM), energy dispersion X-ray analysis (EDX), and electrochemical impedance spectroscopy (EIS). The comparative morphologic, spectroscopic and electrochemical properties of the prepared PANI and PPy nanofilms and nanocomposites were investigated in this study. The effectiveness of polymer and nanocomposite films in preventing the corrosion of Al1050 was tested in 3.5 % NaCl solution. For corrosion tests, anodic polarization curves and EIS were used to investigate their corrosion protection capability in saltwater solution. The highest, low frequency capacitance values were obtained as C-LF = 60.76 and 12.8 mF cm(-2) for PANI/TiO2 and PPy/TiO2 nanocomposites, respectively. The results of these studies revealed that the corrosion protection efficiency (PE) of the PANI/TiO2 (PE = 97.2 %), PPy/TiO2 (PE = 97.4 %) nanocomposites coated on Al1050 electrode was higher than that of PANI (PE = 96.4 %),PPy (PE = 94.9 %) and uncoated Al1050 electrodes. These nanocomposites can be used in airplanes, space technology, automobiles, electronics, and building sectors, as well.