SYNTHETIC METALS, cilt.254, ss.10-21, 2019 (SCI İndekslerine Giren Dergi)
In this study, Polypyrrole vertical bar cobalt oxide (PPy vertical bar Co3O4) composite films were obtained by the galvanostatic method in oxalic acid (OXA) and dodecyl benzene sulfonic acid (DBSA) mix electrolyte on aluminum-1050 (Al-1050). The corrosion protective effect of these films in a 0.1 M HCl corrosive medium was investigated by Tafel polarization method and impedance measurements. Characterization and surface morphology of the films were examined by Fourier transform infrared (FT-IR), Thermogravimetry (TG), Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The OXA-DBSA mix electrolyte significantly increased the homogeneity and adhesion of the films. Cobalt nanoparticles significantly reduced the thickness of the PPy film to about 13 mu m from 50 mu m. The composite film with the highest Co3O4 level showed protection efficiency close to 100%. Polarization resistance values determined from the Cole-Cole plots showed that PPy film increased the resistance of Al-1050 by about 15 times, while the composite films increased the film resistance of Al-1050 up to 124 times, depending on the amount of Co3O4 nanoparticles. It was observed that all of the films in the corrosive medium protected the surface of the Al-1050 quite well even at the end of the fifth day.