Sulfurization in a bath without cyanide

Conclusions

• 1. Many compositions of salt baths fail to meet manufacturing requirements due to the employment of cyanides.

• 2. The Scientific Research Institute of the Automobile Industry has developed a sulfurizing process without the use of cyanides in the bath.

• 3. In applying the sulfurizing process at 560–580° C, harmless salts such as potash, urea and potassium sulfide (or sodium sulfide) are recommended. In sulfurizing at 160–180° C ammonium and potassium thiocyanate are applicable.