Abstract: A process for sulfurizing treatment of ferrous articles comprises positioning an electrolysis crucible containing a molten-salt bath of potassium thiocyanate and sodium thiocyanate and a pretreatment crucible containing a molten-salt bath of substantially the same composition adjacent to each other, assembling a unitary body by setting a plurality of the articles on a conductive support member in electrical contact therewith and attaching a cathode material to the support member to be out of contact with the articles and electrically insulated from the support member, immersing the unitary body in the bath contained in the pretreatment crucible, maintaining this bath temperature at substantially a prescribe bath temperature during ensuing electrolysis to bring the temperature of the unitary body near the prescribed temperature, transferring the unitary body from the pretreatment crucible to the bath in the electrolysis crucible while maintaining its temperature, and treating the articles by electrolysis.