Nb–Cr complex carbide coatings on AISI D2 steel produced by the TRD process
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2014-03-26
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Abstract
Nb–Cr complex carbide coatings were produced onto AISI D2 steel by the thermo-reactive diffusion
process to improve the surface hardness and corrosion
resistance of this tool steel. The carbide coating treatment
was performed using molten borax added with ferroniobium, ferrochrome and aluminum at temperatures of 1,223,
1,293 and 1,363 K during 2, 3, 4 and 5 h. The coating
layers were characterized by optical and Scanning Electron
Microscopy, X-ray diffraction, energy-dispersive X-ray
spectroscopy and X-ray fluorescence spectrometry. The
coating growth rates were evaluated, and a model of the
layer thickness as a function of the treatment time and
temperature was established. The hardness of the coating
was measured by nanoindentation, and its resistance to
corrosion was evaluated with electrochemical tests of potentiodynamic polarization. The produced carbide layers
presented a homogeneous thickness as well as an improved
hardness and corrosion resistance as compared to the
uncoated steel.
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Atribución-NoComercial-CompartirIgual 2.5 Colombia