表面缺陷对于汽车外用热镀锌钢板的成材率具有很大影响, 以钢板表面的典型缺陷分析方法为例, 通过显微组织观察和微区成分分析, 判断了缺陷的成因, 总结了理化检验技术在汽车外用热镀锌合金化钢板生产中的应用方法。结果表明: 缺陷发生的位置在镀锌工位之后、平整工位之前, 设备材料属于有机组成; 通过现场调研发现缺陷设备为一组挤干辊, 通过替换完好的挤干辊保证了生产的顺利进行。

Defects would be play important influence on the quality of hot galvanized steel sheet used for cars. A method was shared to analyze the defect reason by using electronic scanning technology and micro characterization of the chemical composition in defects. Application methods of physical testing and chemical analysis technology in the production of hot galvanized steel sheet used for car were summarized. Results showed that the defects were generated between galvannealing furnace and skin level section, and the chemical composition analysis determined that the black spots were rubber material. Through investigation on the line, it was found that only a wringer roll on the quench tank was made of rubber material between the galvannealing furnace and skin level section. Finally the defects were removed by changing the roll, which ensured the normal production.