Abstract

CASTILLEJO, Fabio; MARULANDA, Diana  and  OLAYA, Jairo. Study of niobium-vanadium ternary carbide coatings produced on d2 tool steel by thermoreactive deposition/diffusion . Rev. LatinAm. Metal. Mater. [online]. 2014, vol.34, n.2, pp.230-239. ISSN 0255-6952.

In this work, the deposition of niobium-vanadium ternary carbide coatings on D2 tool steel by thermoreactive deposition/diffusion (TRD) is presented. The carbides were obtained using salt baths composed of molten borax, ferro-vanadium, ferro-niobium and aluminum, varying its chemical composition, at a temperature of 1020 °C for 4 hours. The coatings were observed via scanning electron microscopy (SEM) and EDS was used to determine the chemical composition. The phases presented were determined using x-ray diffraction (XRD), and nanoindentation was used to measure hardness and elastic modulus. The electrochemical behavior was studied via potentiodynamic polarization curves to determine the rate of corrosion, and electrochemical impedance spectroscopy (EIS) was used to determine the resistance to polarization. The results were compared with the properties of the substrate without a coating, and in general, greater hardness and better corrosion resistance were observed in the coatings.

Keywords : TRD; Niobium - vanadium carbide; Impedance; Hardness.

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