Recubrimientos de VC y NBC producidos por DRT: Tecnología económica, eficiente y ambientalmente limpia

Castillejo, Fabio; Flórez, Jhon Jairo Olaya

doi:10.18359/rcin.251

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…These results agree with those obtained by S. Sen and U. Sen (2008) [11]; Oliveira et al (2006) [12]; Castillejo et al (2013, 2011) [7], [16]; and Orjuela et al (2014) [8]. Figure 1 also shows the planes belonging to the substrates.…”

Section: Corrosion Resistance Analysissupporting

confidence: 90%

“…On the other hand, the coating of niobium carbide on H13 steel showed greater resistance to corrosion compared to uncoated steel. When comparing the coatings on the two steels, a greater corrosion resistance was observed in the coated D2 steel, since it presents a more positive value of the corrosion voltage compared to the coating on steel H13, which is most likely due to the percentage of porosity in the coatings [16]. In general, the niobium carbide coatings tend to improve the corrosion resistance of the substrate-coating system because the corrosion potential has a higher value compared with the uncoated steel; this effect is likely due to the formation of niobium oxide passivation layers on the coating surface [7], [8].…”

Section: Source: Authors' Own Creationmentioning

confidence: 98%

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Niobium carbide coatings produced on tool steels via thermo-reactive diffusion

Guerrero

Flórez

Orjuela

2018

IyU

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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.

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Section: Corrosion Resistance Analysissupporting

confidence: 90%

Section: Source: Authors' Own Creationmentioning

confidence: 98%

Niobium carbide coatings produced on tool steels via thermo-reactive diffusion

Guerrero

Flórez

Orjuela

2018

IyU

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Corrosion resistance of niobium carbide coatings produced on AISI 1045 steel via thermo-reactive diffusion deposition

OrjuelaG.

Rincon

Olaya

2014

Surface and Coatings Technology

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Effect of V addition on the hardness, adherence and friction coefficient of VC coatings produced by thermo-reactive diffusion deposition

Orjuela-Guerrero¹,

Alfonso²,

Olaya-Flórez³

2015

DYNA

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Vanadium carbide (VC) coatings were deposited on AISI H13 and AISI D2 steel substrates via thermo-reactive deposition/diffusion (TRD) in order to evaluate their mechanical properties as a function of the vanadium content. The coatings were produced with different percentages of ferrovanadium in the reactive mixture. The chemical composition of the coatings was determined through X-ray fluorescence (XRF), the crystal structure was analyzed using X-ray diffraction (XRD), the morphology was characterized using scanning electron microscopy (SEM), the hardness was measured with nanoindention, and the tribological behavior was studied using the ball-on-disc test. The XRF analysis indicated that the coatings grown on D2 steel decreased the atomic percentage of vanadium when the coating was made with 20% ferrovanadium. The XRD analysis established that the coatings were polycrystalline, with a cubic structure. The SEM images revealed that the coatings grown on D2 steel were more compact than those grown on H13 steel. Finally, the wear tests established that the friction coefficient decreased with an increase of vanadium in the coating.

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Recubrimientos de VC y NBC producidos por DRT: Tecnología económica, eficiente y ambientalmente limpia

Abstract: This paper offers basics of thermo-reactive deposition/diffusion process (TRD), a technique that may produce inexpensive and non-invasive or aggressive hard coatings to the environment. We

Cited by 4 publications

References 12 publications

Niobium carbide coatings produced on tool steels via thermo-reactive diffusion

Niobium carbide coatings produced on tool steels via thermo-reactive diffusion

Corrosion resistance of niobium carbide coatings produced on AISI 1045 steel via thermo-reactive diffusion deposition

Effect of V addition on the hardness, adherence and friction coefficient of VC coatings produced by thermo-reactive diffusion deposition

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