公开(公告)号：EP1734147A1

公开(公告)日：2006-12-20

申请号：EP05727135.5

申请日：2005-03-25

申请人： SONY CORPORATION ,  Tamura Corporation ,  Tamura Fa System Corporation ,  Kyokuto Nitriding Co., Ltd.

发明人： SAITO, Takashi, SONY CORPORATION ,  MIZUMURA, Kaoru ,  OKANO, Teruo, TAMURA FA SYSTEM CORPORATION ,  KEZUKA, Kozo, TAMURA FA SYSTEM CORPORATION ,  IIJIMA, Masaki, TAMURA FA SYSTEM CORPORATION ,  YOSHIDA, Shunichi, TAMURA FA SYSTEM CORPORATION

IPC分类号： C23C8/28 ,  B23K3/06 ,  C21D1/06 ,  H05K3/34

CPC分类号： B23K3/0646 ,  C23C8/02 ,  C23C8/28 ,  C23C8/34

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.

摘要翻译： 在奥氏体不锈钢的表面上形成包括不包括氮化铬（CrN）的氮化物重整层的钝化膜。 由氧化铬组成的钝化膜用作无铅焊料的保护膜。 结果，即使在与其熔融焊料中的无铅焊料接触的情况下，不锈钢的表面也难以腐蚀，从而显着提高其耐腐蚀性和耐磨性。 在SUS316不锈钢的情况下，在其最外表面上形成钝化膜的情况下，不锈钢腐蚀开始的经过一段时间开始延伸至约500小时，如图1所示的线Le。 4，与常规腐蚀深度相比，其腐蚀深度比较浅（20〜25μm），从而预期其耐用年能达到类似于使用铅焊料的程度，以获得不锈钢 钢具有增强的耐腐蚀性。