Electro chemical characterization of V_(X)Nb_(Y)C_(Z)/Bi_(X)Ti_(Y)O_(Z) coatings produced through thermo-reactive diffusion and the sputtering technique

• Autores: S.A. Castro-Hermosa, J. E. Alfonso, John Jairo Olaya Flórez
• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 62, Nº. 2, 2016, págs. 138-143
• Idioma: inglés
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• Resumen

  • We present an experimental study of the structural evolution of a bilayer V_(X)Nb_(Y)C_(Z)/Bi_(X)Ti_(Y)O_(Z) coating produced via thermo-reactive diffusion (TRD) and the RF sputtering process on D2 steel substrate. The TRD treatments were carried out in a molten mixture consisting of borax, ferro-niobium, ferro-vanadium, and aluminum, at 1313 K for 3 hours, using a resistance-heating furnace. Bi_(X)Ti_(Y)O_(Z) coating were deposited using RF magnetron sputtering on TRD coatings, in order to carry out a study of the corrosion behavior of this compound. The crystallographic structure of the coatings was determined via X-ray diffraction (XRD), the corrosion resistance was analyzed through the potentiodynamic polarization test (Tafel Extrapolation) and electrochemical impedance spectroscopic analysis (EIS). XRD patterns showed that coating were amorphous. The electrochemical studies showed that the ternary coating (VNbC_(2)) was preferentially oriented along the [200] direction with a cubic-centered face structure, and the Bi_(X)Ti_(Y)O_(Z) coatings were amorphous. The electrochemical studies showed that the resistance corrosion of the coating increased with respect to the bare substrate, and that polarization resistance in the bilayer coating increased with respect to the ternary coatings, suggesting that the titanate has anticorrosive barrier effects.