Wear and corrosion resistance of Niobium-Chromium carbide coatings on AISI D2 produced through TRD
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Abstract
Niobium carbide, chromium carbide and niobium - chromium carbide coatings were
deposited using the thermo-reactive diffusion (TRD) deposition technique on AISI D2 steel
substrates, and their wear and corrosion resistance was studied. The morphology of the
coatings was characterized through optical and scanning electron microscopy (SEM), and the
crystalline structure was studied through X-ray diffraction (XRD). Chemical composition was
evaluated via energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron
spectroscopy (XPS). The hardness of the coatings was measured through nanoindentation, and
their wear was studied using the ball on disk test. The electrochemical behavior was assessed
with potentiodynamic polarization and electrochemical impedance (EIS) tests. The XRD
results show the formation of the NbC for the niobium carbide coating, Cr23C6 and Cr7C3 for
the chromium carbide coating, and NbC, Cr23C6 and Cr7C3 for the niobium-chromium coating.
Hardness value for the niobium-chromium carbide coating was 27.62 ± 2.56 GPa, which was
higher in comparison to 21.66 ± 0.5 GPa for niobium carbide, 14.7 ± 1.1 GPa for chromium
carbide and 6.70 ± 0.28 GPa for the uncoated steel. The wear resistance obtained was higher
for the niobium-chromium carbide coating. However, its corrosion resistance was lower than
the corrosion resistance for binary coatings.
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Atribución-NoComercial-CompartirIgual 2.5 Colombia