Corrosion Behavior of VN20 Alloy Doped with Graphite or Chromium and Vanadium Carbides

摘要

We study the corrosion properties of a composite material based on tungsten carbide on a nickel binder and doped with graphite or chromium and vanadium carbides. It is shown that the introduction of graphite in the VN20 composite decreases its corrosion resistance in a 3-% NaCl solution. The addition of 2 and 4% graphite makes the corrosion current densities 2 and 2.5 times higher, respectively. Doping of the composite with vanadium carbide in amounts of 0.15 and 1% increases the corrosion currents, whereas the introduction of 1% of chromium carbide weakens these currents by about an order of magnitude.