Investigación

 

Electro chemical characterization of V_XNb_YC_Z/Bi_XTi_YO_Z coatings produced through thermo-reactive diffusion and the sputtering technique

 

S.A. Castro-Hermosa^a,b, J.E. Alfonso^a,* and J.J. Olaya^a,b

 

^a Grupo de Ciencia de Materiales y Superficies, Departamento de Física, Universidad Nacional de Colombia, Bogotá AA 14490, Colombia. * e-mail: jealfonsoo@unal.edu.co

^b Grupo de Investigación Análisis de Fallas, Integridad y Superficies, Universidad Nacional de Colombia, Bogotá AA 14490, Colombia.

 

Received 23 February 2015;
accepted 4 January 2016

 

Abstract

We present an experimental study of the structural evolution of a bilayer V_X Nb_Y C_Z /Bix 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_XTi_YO_Z coatings 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 po-tentiodynamic polarization test (Tafel Extrapolation) and electrochemical impedance spectroscopic analysis (EIS). XRD patterns showed that the ternary coating (VNbC₂) was preferentially oriented along the [200] direction with a cubic-centered face structure, and the Bi_XTi_YO_Z coatings were amorphous. The electrochemical studies showed that the resistance corrosion of the coatings increased with respect to the bare substrate, and that polarization resistance in the bilayer coatings increased with respect to the ternary coatings, suggesting that the titanate has anticorrosive barrier effects.

Keywords: Thermo reactive diffusion; bismuth titanate coatings; corrosion resistance; RF sputtering.

PACS: 43.50.GF; 79.20.RF; 82.425.Bb; 81.15.-Z

 

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Acknowledgments

The authors are grateful to the Universidad Nacional de Colombia for financial support grants through the projects 15222 and 15059 of the DIB, and the founds of patrimonio autónomo Fondo Nacional de Financiamiento para la Ciencia, la Tecnología y la Innovacion Francisco Jose de Caldas.

 

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