Zn(Ta1-xNbx)2O6 pseudo-binary oxide nanocrystalline materials (where x = 1;
0.5; 0.1; 0.05 and 0) were obtained through the solid-state method and
characterized by X-ray diffraction, Fourier Transform Infrared Spectroscopy
and Ultraviolet-visible spectroscopy. In addition, their morphology and
topography have been determined by field emission-scanning electron
microscopy (SEM) and atomic force microscopy (AFM). There is a significant
dependence between the rugosity and the uniformity of crystals. The evenly
crystals organized in multilayers have the lowest value of rugosity and the
non uniform fractal type architectures have the highest value of rugosity.
The compounds? anti-corrosion features were evaluated after deposition on
carbon steel (OL) in 0.1 M Na2SO4 media by open circuit potential measurement
and potentiodynamic polarization technique with Tafel representation. The
inhibition efficiency of pseudo-binary oxides deposited on carbon steel
electrode was in the range 42.3-52.7 % promising for their further multiple
layer deposition with porphyrins in order to improve anticorrosion
properties. Due to the high band gap (3.80 - 4.30 eV) provided by increasing
the tantalum content, four of these pseudo-binary oxides might find
applications in photovoltaic cells.
Obtaining of ZnTa2O6 and ZnV2O6 pseudo-binary oxide materials by hydrothermal and coprecipitation methods and of Zn(II) 5-pyridyl-10,15,20-tris-(3,4-di-methoxy-phenyl) porphyrin (ZnPydiMeOPP) are presented. Mixed thin films of pseudo-binary oxide materials and Zn-porphyrin were realized by pulsed laser deposition (PLD) technique on steel disks and corrosion tests in 0.1 M HCl solution were performed. The inhibition efficiency (IE) in all cases containing porphyrin was always higher than 80%. The best IE (84.50%) was obtained for the sandwich structure using the hydrothermally obtained ZnV2O6 oxide as the first layer and the ZnPydiMeOPP porphyrin as the second layer. The mechanism of corrosion protection can be explained by the physical/mechanical barrier effect.
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