论文部分内容阅读
对420马氏体不锈钢进行低温(400~490°C)盐浴渗氮。通过X射线衍射仪、光学显微镜、扫描电镜、显微硬度仪、电化学方法等,研究了温度对不锈钢渗氮层的显微结构、厚度、耐蚀性以及显微硬度的影响。结果表明,渗氮层主要由铁氮化物和αN组成;经低温盐浴渗氮后,不锈钢的显微硬度明显提高,在腐蚀性介质中其表面能生成有效钝化膜,耐蚀性和耐冲刷腐蚀能力提高;长时间高温渗氮会使不锈钢出现贫铬现象,导致显微硬度和耐蚀性降低。
420 martensitic stainless steel for low temperature (400 ~ 490 ° C) salt bath nitriding. The effects of temperature on the microstructure, thickness, corrosion resistance and microhardness of stainless steel nitrided layer were investigated by X-ray diffraction, optical microscope, scanning electron microscopy, microhardness tester and electrochemical method. The results show that the nitrided layer mainly consists of iron nitride and αN. After nitriding in low temperature salt bath, the microhardness of stainless steel increases obviously, and its surface energy can form effective passivation film in corrosive medium. The corrosion resistance and resistance Scour corrosion increased; long-term high temperature nitriding will make stainless steel appears chromium-poor phenomenon, resulting in reduced microhardness and corrosion resistance.