轧辊凸包状毛化铬镀层的耐腐蚀性能研究  

Study on Corrosion Resistance of Convex Hull Shaped and Roughened Chromium Coating of Roller

作　　者：严波[1] 刘德荣[1] 秦真波 吴忠[1] 刘磊[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《电镀与精饰》2016年第4期1-5,共5页Plating & Finishing

基　　金：国家高技术研究发展计划(863)(2013AA031604)

摘　　要：为了提高毛化特征轧辊的耐磨性,在制造9Cr2Mo钢轧辊表面电沉积40μm凸包状毛化铬镀层。通过电化学测试和盐雾试验研究了镀铬层和9Cr2Mo钢基体的腐蚀行为。电化学测试表明,镀铬层的耐蚀性明显优于基体。扫描电镜观测表明,经盐雾试验51 h的基体出现大量腐蚀产物FeO,而镀铬层腐蚀产物细小且集中在表面裂纹附近,主要成分同样为FeO。镀铬层截面金相观察表明,盐雾通过铬层裂纹进入镀层和基体界面产生腐蚀,腐蚀产物通过裂纹通道扩散出来。In order to enhance the wear resistance of the rollers,the convex hull shaped and roughened chromium coating with 40 μm thickness was formed on the surface of 9Cr2 Mo roller steel by electrodeposition method. The corrosion behaviors of the chromium coating and 9Cr2 Mo steel substrate were studied by electrochemical and salt spray tests. The electrochemical test showed that the corrosion resistance of the chromium coating was better than that of substrate. The scanning electron microscopy observation showed that a lot of corrosion products FeO appeared on the substrate after 51 h salt spray test,while tiny and small corrosion products（ the main ingredients were also FeO） concentrated near surface cracks on the chromium coating. The section metallographic observation of chromium coating indicated that salt fog could pass into the interface of coating and substrate through the cracks and then corrosion occurred,corrosion products would diffused out through the crack channel.

关 键 词：9Cr2Mo轧辊 铬镀层 电化学测试 盐雾试验 腐蚀行为 裂纹通道 

分 类 号：TQ153.1[化学工程—电化学工业]