镀层厚度对镀铬钢板性能的影响  

Effect of Coating Thickness on Performance of Chromium Plating Steel Plate

作　　者：吴首民[1] 陈声鹤[1] 周庚瑞[1] 高发明[2] 于升学[2] 

机构地区：[1]宝钢股份冷轧薄板厂,上海200431 [2]燕山大学应用化学系,秦皇岛066004

出　　处：《机械工程材料》2011年第3期25-27,35,共4页Materials For Mechanical Engineering

摘　　要：利用两步法在二次冷轧钢板表面电镀金属铬层和氧化铬层得到了镀铬钢板,用分光光度计测试了镀铬钢板的铁溶出量,应用电化学方法测试镀铬钢板的极化曲线,采用湿热试验、盐雾试验和贴滤纸法评价了镀铬钢板的耐蚀性能,采用落锤法评定了镀铬钢板与油漆的结合强度,用扫描电镜观察了表面形貌。结果表明:在氧化铬层厚度一定时随着镀铬层厚度(单位面积质量)的增加,铁溶出值减小,耐湿热和盐雾性能增强,但耐盐雾性能都较差;在镀层总厚度一定时,镀铬钢板与油漆结合性能随氧化铬层厚度增大而增强;钢板电镀铬后,焊接性能变差。Chromium plating steel plates containing chromium and chromium oxide on the surface of double cold rolling sheet by two-step method. The iron dissolved quantity and polarization curves of the plates were tested using spectrophotometer and electrochemical method. The corrosion resistance of the plates was evaluated by means of damp-heat test, salt-fog test and Pasting filter paper method. The bonding strength of the plates with paint was studied by drop weight method, and the scanning electron microscopy was performed to observe the surface morphology. The results show that when the thickness of the chromium oxide coating was stable, with the increase of the thickness （weight per unit area） of the Cr plating coating, iron dissolved quantity decreased, damp-heat resistance and salt-fog performance enhanced, while the salt-fog resistance was poor. When the thickness of the whole chromium coating was stable, the bonding properties of the plates with paint increased with increasing the chromium oxide thickness. The weldability of the plates after electroplating Cr became poor.

关 键 词：镀铬钢板 两步法镀铬 镀层厚度 耐蚀性能 焊接性能 

分 类 号：TQ153.15[化学工程—电化学工业]