BEDEFRGBITLUNLSE0147011EUROPEAN PATENT APPLICATIONA319860326EP843063361984091756628819831228US1986032619861319850703198527 6C 23C 08/46 AenA non-cyanide salt bath and process for carburization of ferrous metals and alloysfrBain de sel sans cyanure et procédé de carburation de métaux et alliages ferreuxdeCyanidfreies Salzbad und Verfahren zur Aufkohlung von eisenhaltigen Metallen und LegierungenHEATBATH CORPORATIONJones, William C.Britt, Kenneth R.Newell, Isaac L.BEDEFRGBITLUNLSE19860326198613

A non-cyanide molten salt bath composition for the . carburization of objects made of ferrous metals or alloys at a temperature in the range of 900-1050°C comprises:

(a) 85-99% of an alkali metal chloride or a mixture of alkali metal chlorides;
(b) 0.25-8% of an activator, which is an oxygen containing compound barium and/or strontium compound and
(c) sufficient amount of finely divided graphite to provide a continuous cover on the surface of the molten salt mixture. The ferrous metal or alloy part is immersed in the molten mixture at a temperature jn the range of 900°C to 1050°C.