Metal treatment – Compositions – Heat treating
Patent
1976-06-30
1977-04-26
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
148 20, 148 27, C21D 148
Patent
active
040199282
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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Karrer, P.; Organic Chemistry, New York 1938, pp. 207, 212 and 246.
Beyer Hermann
Biberbach Peter
Scondo Christian
Duetsche Gold- und Silber-Scheideanstalt vormals Roessler
Satterfield Walter R.
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