C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/63
C23C 8/40 (2006.01)
Patent
CA 1036916
ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the regeneration of a carbonate-containing molten salt bath used in nitriding or carburizing metal workpieces, said bath con- taining essentially at least one of a member of the group consisting of potassium cyanate alone, potassium cyanate admixed with at least one compound of the group consisting of sodium cyanate, potassium carbonate, sodium carbonate and an alkali metal chloride, sodium cyanate admixed with at least one compound of the group consisting of potassium carbonate, sodium carbonate and an alkali metal chloride, and alkali metal cyanide admixed with barium chloride and which may also contain at least one of an alkali metal carbonate and alkali metal chloride after the alkali metal cyanide or alkali metal cyanate content of the bath has fallen and the carbonate content has increased during use, which process comprises reajusting the cyanide or cyanate content and carbonate content by adding to the molten bath a polymeric organic compound containing carbon and nitrogen selected from the group consisting of polymeric triazine com- pounds, polymeric urea compounds, polymers of hydrocyanic acid and other polymeric carboxylic amides, said compound being unaffected by changes of temperature under standard environ- mental conditions and being suitable for addition to salt melts at temperatures between 500 and 950°C without giving off toxic or dangerous components or otherwise endangering operating personnel or the environment and being added to the molten bath in a quantity sufficient to maintain the nitriding or carburiz- ing efficiency of the bath,
194051
Beyer Hermann
Biberbach Peter
Scondo Christian
Deutsche Gold Und- Silber-Scheideanstalt Vormals Roessler
Na
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