Advances in materials Research

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Characterization of vanadium carbide coating deposited by borax salt bath process

  • Aghaie-Khafri, M. (Faculty of Mechanical Engineering, K. N. Toosi University of Technology) ;
  • Daemi, N. (Faculty of Mechanical Engineering, K. N. Toosi University of Technology)
  • Received : 2012.04.11
  • Accepted : 2012.08.31
  • Published : 2012.09.25
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Abstract

Thermal reactive diffusion coating of vanadium carbide on DIN 2714 steel substrate was performed in a molten borax bath at $950-1050^{\circ}C$. The coating formed on the surface of the substrate had uniform thickness ($1-12{\mu}m$) all over the surface and the coating layer was hard (2430-2700 HV), dense, smooth and compact. The influence of the kinetics parameters, temperature and time, has been investigated. Vanadium carbide coating was characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) and X-ray diffraction analysis (XRD). The corrosion resistance of the coating was evaluated by potentiodynamic polarization in 3.5% NaCl solution. The results obtained showed that decrease of coating microhardness following increasing time and temperature is owing to the coarsening of carbides and coating grain size.

Keywords

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