JPS55100983A - Surface treatment of metal material - Google Patents

Abstract

PURPOSE: To give low abrasive property and high wear resistance to the surface of metal by forming a sulfide layer by keeping a metal material at a fixed temperature and under reduced pressure in an atmosphere of CS₂ and any one of air, CO₂, H₂, and O₂.

CONSTITUTION: A metal material (e.g., SS41 steel) is charged in a furnace with CS₂ and any one of air, CO₂, H₂, and O₂ and then kept at 300W600°C and under one atom, particularly while keeping the pressure of CS₂ at 10W300 Torr. Preferably, in the case the other gas, e.g., air or H₂, its pressure shaould be kept at 5W300 Torr, or in the case of CO₂ or O₂, its pressure shoul be kept at 1W150 Torr. Also, the preferred maintenance time of the foresaid temperature is 0.5W20hr. Thus, H₂S formed is fixed in the form of solid sulfides by the introduction of an element, e.g., Mn, etc., having a high affinity to S, after treatment. Thus, H₂S can be easily removed and also treatment is very easy and no harmful gas, e.g., HCN, etc., emits because of no use of NaCN, etc., as in the conventional cases, permitting operational control to made easier.

COPYRIGHT: (C)1980,JPO&Japio