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Primary Examiner: Satterfield, Walter R.
Assistant Examiner:
Attorney: Cushman, Darby & Cushman

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Title: Process for nitriding iron and steel in salt baths regenerated with triazine polymers

Abstract: Iron and steel are nitrided in a salt bath in a process favorable to the environment. The salt bath consists essentially of potassium cyanate, sodium cyanate, potassium carbonate, and sodium carbonate. Preferably, air flows through the bath. The bath preferably contains 25-57 weight % of cyanate calculated as cyanate ion, 0 to 30% alkali metal chloride and the balance carbonate and alkali metal ions. Preferably cyanide is omitted, but it can be present in an amount up to 5%. Without removing the waste salt, the bath is regenerated by adding melon, melam, or melem.

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Inventors: Beyer, Hermann (Hanau, DT)
Biberbach, Peter (Hanau, DT)
Scondo, Christian (Hanau, DT)

Application Number: 701361
Filing Date: 1976-06-30
Publication_date: 1977-04-26
Assignee: Duetsche Gold- und Silber-Scheideanstalt vormals Roessler (Frankfurt, DT)
Primary Class(es): 148/228 148/27
Other Classes:
US Patent Ref:

2095188	Oct, 1937	Hanusch	148/30.
2231010	Feb, 1941	Holt	148/15.
2541085	Feb, 1951	Morral	148/30.
2562065	Jul, 1951	Sawyer et al.	148/27.
2568860	Sep, 1951	Leininger et al.	148/15.
2711981	Jun, 1955	Waterfall et al.	148/15.
2927875	Mar, 1960	Muller	148/15.
3022204	Feb, 1962	Muller et al.	148/15.
3303063	Feb, 1967	Pietryka	148/15.
3793208	Feb, 1974	Foreman	148/15.
3912547	Oct, 1975	Gaucher et al.	148/15.

Other Refs: Other References: Karrer, P.; Organic Chemistry, New York 1938, pp. 207, 212 and 246.