Title:
【発明の名称】鉄金属部品の耐磨耗性及び耐蝕性の改良方法
Document Type and Number:
Japanese Patent JP3083453
Kind Code:
B2
Abstract:
The process consists in immersing the articles which have previously undergone a thermochemical diffusion of either nitriding or sulphonitriding or carbonitriding type, in a bath of molten salts made up of alkali metal carbonates, nitrates, hydroxides and their oxygenated salts, the relative anionic weight quantities of carbonates, nitrates and hydroxides, expressed for sodium salts and corresponding to the active, that is to say liquid, phase of the bath being the following: 11 < CO<2-> < 23 19 < NO3<-> < 37 6 < OH<-> < 19 while the weight quantity of oxygenated salts of alkali metals, expressed as Cr2O7<2-> equivalent, is the following: 0.05 < oxygenated anions < 0.5. This process makes it possible to guarantee a high degree of reproducibility of the results, whatever the type of articles treated.
Inventors:
Jean Portie
Application Number:
JP18724394A
Publication Date:
September 04, 2000
Filing Date:
August 09, 1994
Export Citation:
Assignee:
Center Stephanie de l'Hersche Mechanic Hidromechanique Frotmann
International Classes:
C23C8/50; C23C8/80; C23C22/72; C23C28/04; C23F15/00; C23C8/42; (IPC1-7): C23C8/50; C23C8/42; C23C8/80; C23C22/72; C23C28/04; C23F15/00
Attorney, Agent or Firm:
Minoru Nakamura (6 outside)