Published Aug 9, 2018



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Fredy Alejandro Orjuela-Guerrero, MSc

John Jairo Olaya-Florez, PhD

José Edgar Alfonso-Orjuela, PhD

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Abstract

Objective: In this work, niobium carbide (NbC) coatings were deposited on substrates of the tool steels AISI H13 and AISI D2 using thermo-reactive deposition/diffusion (TRD) in order to analyze their behavior against corrosion in a saline environment. Materials and methods: The niobium carbides were obtained using salt baths composed of borax pentahydrate, aluminum and ferroniobium. This mixture was heated at 1050 °C for 4 hours. The chemical composition was determined by X-ray fluorescence (XRF). The coatings were morphologically characterized using scanning electron microscopy (SEM), the crystal structure was analyzed using X-ray diffraction (XRD), and the electrochemical behavior was studied using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). Results and discussion: The XRF analysis indicated that the coatings contained 87.476 wt% Nb and 51.943 wt% Nb for the D2-substrate and the H13-substrate, respectively. The SEM images revealed that the morphology of the surface of the coatings was homogeneous. The XRD analysis established that the coatings were polycrystalline, and the electrochemical tests established that the corrosion resistance increased slightly in the covered substrates with respect to the uncoated steels, with the best results being obtained in the layers of niobium carbide deposited on AISI D2 steel. Conclusions: The analysis of corrosion resistance revealed that the coatings prepared on D2 steel have a higher corrosion resistance because they have fewer surface imperfections, which causes the coating to exhibit a dielectric behavior.

Keywords

Coating, Carbides, Niobium, CorrosionRecubrimientos, Carburos, Niobio, Corrosión

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How to Cite
Orjuela-Guerrero, F. A., Olaya-Florez, J. J., & Alfonso-Orjuela, J. E. (2018). Niobium carbide coatings produced on tool steels via thermo-reactive diffusion. Ingenieria Y Universidad, 22(2). https://doi.org/10.11144/Javeriana.iyu22-2.nccp
Section
Bioengineering and chemical engineering

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