Regeneration agent for carburization salt bath

Details Regeneration agent for carburization salt bath Regeneration agent for carburization salt bath

1983-12-29

1985-04-09

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 28, 148 27, 148 30, 528257, C21D 148

Patent

active

045099936

ABSTRACT:
It is known to regenerate salt baths for nitriding parts of iron and steel with polymers of organic materials, which polymers, however, could not be used in carburizing salt baths since with them there only are formed slight amounts of carburizing active cyanide, the baths foam, and carbon residues are formed. An excellent regeneration agent for carburizing salt baths is obtained by using polymeric organic compounds of the overall composition [C.sub.6 H.sub.x N.sub.y ].sub.z where x is 3 to 5, y is 5 to 8, and z is 10 to 10,000. These compounds are obtained by reacting formaldehyde with cyanamide and/or dicyandiamide and/or melamine and pyrolytically decomposing the reaction product at 300.degree. to 600.degree. C.

REFERENCES:
patent: 3303063 (1967-02-01), Pietryka
patent: 3847597 (1974-11-01), Mueller et al.
patent: 4006043 (1977-02-01), Gaucher et al.
patent: 4019928 (1977-04-01), Beyer et al.

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