发明公开
EP0725160A1 METHOD OF FORMING PASSIVE OXIDE FILM BASED ON CHROMIUM OXIDE AND STAINLESS STEEL
失效
METHOD FOR PRODUCING PASSIVE氧化膜基于铬氧化物和不锈钢
- 专利标题： METHOD OF FORMING PASSIVE OXIDE FILM BASED ON CHROMIUM OXIDE AND STAINLESS STEEL
- 专利标题（中）： METHOD FOR PRODUCING PASSIVE氧化膜基于铬氧化物和不锈钢
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申请号： EP92923995.2申请日： 1992-11-20
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公开(公告)号： EP0725160A1公开(公告)日： 1996-08-07
- 发明人: OHMI, Tadahiro
- 申请人： OHMI, Tadahiro
- 申请人地址： 1-17-301, Komegabukuro 2-chome Sendai-shi Miyagi-ken 980 JP
- 专利权人： OHMI, Tadahiro
- 当前专利权人： OHMI, Tadahiro
- 当前专利权人地址： 1-17-301, Komegabukuro 2-chome Sendai-shi Miyagi-ken 980 JP
- 代理机构： Weitzel, Wolfgang, Dr.-Ing. Patentanwalt
- 优先权： JP331349/91 19911120; JP164377/92 19920529
- 国际公布： WO9310274 19930527
- 主分类号： C23C8/14
- IPC分类号： C23C8/14 ; C23C8/18 ; C22C38/44 ; C23C8/02
摘要：
A method of readily forming a passive oxide film based on chromium oxide characterized by subjecting stainless steel to electrolytic polishing, composite electrolytic polishing and fluidized abrasive polishing, baking the steel thus treated in an inactive gas to remove moisture from its surface, and heat treating the resultant steel at 300 to 600 °C in a gaseous atmosphere comprising hydrogen or a mixture thereof with an inactive gas and containing less than 4 ppm of oxygen or less than 500 ppb of moisture. An oxidized stainless steel characterized by comprising a stainless steel having a crystal grain number of 6 or above and, formed on the surface thereof, a passive oxide film based on chromium oxide, wherein the oxide film has a thickness of 5 nm or above and the atomic ratio of chromium to iron on the outermost layer of the film is 1 or above.
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