发明申请
- 专利标题： Method For Manufacturing Austenitic Stainless Steel, Solder-Melting Tank, And Automatic Soldering Apparatus
- 专利标题（中）： 制造奥氏体不锈钢，焊锡罐和自动焊接设备的方法
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申请号： US10594002申请日： 2005-03-25
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公开(公告)号： US20070295426A1公开(公告)日： 2007-12-27
- 发明人: Takashi Saito , Kaoru Mizumura , Teruo Okano , Kozo Kezuka , Masaki Iijima , Shunichi Yoshida
- 申请人： Takashi Saito , Kaoru Mizumura , Teruo Okano , Kozo Kezuka , Masaki Iijima , Shunichi Yoshida
- 申请人地址： JP Tokyo 108-0075 JP Tokyo 178-8511 JP Saitama 350-1300 JP Kangawa 259-1303
- 专利权人： SONY CORPORATION,TAMURA CORPORATION,TAMURA FA SYSTEM CORPORATION,KYOKUTO NITRIDING CO., LTD.
- 当前专利权人： SONY CORPORATION,TAMURA CORPORATION,TAMURA FA SYSTEM CORPORATION,KYOKUTO NITRIDING CO., LTD.
- 当前专利权人地址： JP Tokyo 108-0075 JP Tokyo 178-8511 JP Saitama 350-1300 JP Kangawa 259-1303
- 优先权： JP2004-093709 20040326
- 国际申请： PCT/JP05/05538 WO 20050325
- 主分类号： C23C8/40
- IPC分类号： C23C8/40 ; B23K37/00
摘要：
A passivation film including a nitride-reformed layer that excludes chromium nitride (CrN) is formed on a surface of an austenitic stainless steel. The passivation film composed of chromium oxide functions as protection film against lead-free solder. As a result, the surface of stainless steel is hard to be corroded even when it contacts with the lead-free solder in its melted solder, thereby improving its corrosion resistance and its wear resistance substantially. In a case of SUS316 stainless steel, on an outermost surface of which the passivation film is formed, a period of lapsed time until corrosion of the stainless steel starts extends to about 500 hours as line Le shown in FIG. 4, and its corrosion depth indicates shallower one (20 through 25 μm) as compared with the conventional one, thereby expecting that its durable year can be improved to an extent similar to that using a lead-filled solder, in order to obtain a stainless steel with enhanced corrosion resistance.
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