Low-temperature rapid ion nitriding method of austenitic stainless steel

• Main Authors: WANG SHUKAI, SONG JIANXIN, HU JING, LI JINGCAI
• Format: Patent
• Language: Chinese; English
• Published: 07.08.2013
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to a surface treatment method and particularly relates to a low-temperature rapid ion nitriding method of austenitic stainless steel. According to the method disclosed by the invention, a thicker ion nitriding layer can be obtained by changing gas pressure in an ion nitriding furnace and performing heat preservation for a period of time at the ion nitriding temperature of 350-370 DEG C. The preparation method comprises the following steps of: firstly removing oil stains on the austenitic stainless steel, performing pre-grinding treatment on a test sample, and then performing ultrasonic cleaning and drying in an organic solvent; then placing the well prepared test sample into a vacuum chamber of an ion nitriding device, performing vacuum-pumping operation to the required vacuum degree, and then introducing hydrogen to perform ion bombard cleaning; and finally adjusting ion nitriding pressure and heat preservation time during the low-temperature ion nitriding process to obtain the thicker