METHOD AND COMPOSITION FOR DIFFUSION ALLOYING OF FERROUS MATERIALS

摘要

A method for diffusion coating workpieces of ferrous base metals such as carbon steel and cast iron includes the step of weighing and mixing the following components, in powdered form: Chromium 40-50 wt.%, Ferrochromium 2537 wt.%, Tantalum Carbide 0.40-0.65 wt.%, Vanadium 0.35-0.70 wt.%, Ammonium Halide 4-5 wt.%, Aluminum Oxide remainder. The workpieces are preferably degreased and then placed in a container with the mixed components. The container is sealed and heated to a temperature of 1000-1050 ~C. The workpieces and the composition are kept at that temperature for a predetermined period, on the order of forty-five minutes or longer, to permit a surface layer of desired thickness to form. The container is then cooled in a conventional cooling chamber and the workpieces are removed. The method produces coatings having good wear and corrosion resistance.