SUMMARY
Diffusion carbide layers produced on cold-work tool steel surface by means of vacuum titanizing process have been studied. The new technological process combining vacuum titanizing process with an electrolytic deposition of Ni-Mo alloy has been proposed to increase
the corrosion resistance of carbide layers. As a result, composite carbide layers of TiC + (Ni-Mo) type have been obtained on the tool steel surface. The investigation object was to determine the microstructure of TiC + (Ni-Mo) composite layers, their corrosion resistance and tribological properties. It has been proved, that wear resistance by friction of TiC + (Ni-Mo) type composite layers, produced by vacuum titanizing process of tool steels covered with Ni-Mo electrolytic coating, is as good as TiC type carbide layers produced on steel surface without any electrolytic coating, but their corrosion resistance in 0.1 M H₂SO4 solution is several times higher.

Keywords
Vacuum titanizing, carbide layer, tribological properties, corrosion resistance..

¹ Instytut Mechaniki Precyzyjnej, Warszawa