镀锡板表面黄斑缺陷分析  

Analysis on the defect of yellow stain on tinplate surface

作　　者：柳长福[1] 刘海军[2] 黄先球[1] 涂元强[1] 白会平[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080 [2]武汉钢铁(集团)公司制造部,湖北武汉430083

出　　处：《钢铁研究》2010年第5期30-32,共3页Research on Iron and Steel

摘　　要：采用金相显微镜、电子显微镜配合能谱分析、辉光光谱仪及电化学方法,对产生黄斑缺陷的镀锡板进行了分析和研究。检验结果表明,镀锡板表面黄色斑点是锡的氧化物;进一步的分析发现,黄斑缺陷的产生与镀锡机组在生产过程中辊子对镀锡板的擦伤有关,由于在镀锡板生产过程中表面锡层和钝化膜被擦伤,破坏了锡层和铬酸盐钝化膜的连续性,当遇到空气中的湿气时,擦伤处的腐蚀电流比没有擦伤的正常镀锡板的腐蚀电流大,使这些区域的耐蚀能力降低,容易氧化发黄,从而导致黄斑缺陷的产生。Tinplates with yellow stain defect were studied and analyzed by optical microscopy, electron microscopy with energy spectrum, glow spectroscopy and electrochemical methods. The results showed that the component of the yellow stain was tin oxide. Further analysis showed that its formation was related to scratch caused by rollers in the tinning process. The uniformity of tin layer and the chromate passivation film was destroyed due to the scratch. When scratched tinplate was exposed to moist air, the corrosion current in scratched area was higher than that in normal area, which led to the weakening of anti-corrison ability and easy oxidation. As a result, the defect of yellow stain appeared.

关 键 词：镀锡板 铬酸盐钝化膜 黄斑缺陷 

分 类 号：TG356.27[金属学及工艺—金属压力加工]