Nb-V-Cr carbide coatings deposited by thermoreactive deposition/diffusion process (TRD)
Abstract
This paper shows the results obtained from the coating deposit process of vanadium-niobium-chromium carbide on steel AISI/SAE 1045 and AISI/SAE H13 using the thermo-reactive deposition/diffusion process (TRD). The coatings were obtained using a bath of molten salts composed of borax, ferro-niobium, ferro-vanadium and ferro-chrome aluminum, with variations in the content of chromium, at a temperature of 1020 ° C for 4 hours. The presence of binary phases VC, NbC, CrC was evident by the technique of X-ray diffraction. Morphological and surface chemical properties of the coatings were studied by the scanning electron microscopy technique (SEM-EDS). The hardness of the coatings was determined using a LECO microindentador M-400-G2 with a maximum load of 300g. The electrochemical behavior was studied using potentiodynamic polarization curves to determine the corrosion current density. The tribological behavior was analyzed by the “Ball-on-disc” test, finding a lower friction coefficient in coated materials with respect to the uncoated substrate.
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