热基镀锌钢板表面麻点缺陷分析  

Analysis on surfacepitting defects of hot-rolled galvanized steel sheet

作　　者：李士明 张杰[1,2] 刘昕 张子月[1] 陈斌锴 张启富 Li Shiming;Zhang Jie;Liu Xin;Zhang Ziyue;Chen Binkai;Zhang Qifu(National Engineering Lab of Advanced Coating Technology for Metallic Material,Central Iron&Steel Research Institute Co.,Ltd.,Beijing 100081,China;CISRI Engineering Design Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司先进金属材料涂镀国家工程实验室,北京100081 [2]钢研工程设计有限公司,北京100081

出　　处：《金属热处理》2024年第10期278-283,共6页Heat Treatment of Metals

摘　　要：通过系统的表面检测、微观结构分析和化学成分测试,探讨了热基镀锌板表面麻点缺陷的产生成因。结果表明,因退火炉内露点异常,导致炉内气氛的还原性不足,使钢带表面在退火炉内氧化,生成氧化铁,导致镀锌时热轧基板表面润湿性不足,影响Fe-Al抑制层的形成,形成针孔漏镀;针孔漏镀点在钢带出锌锅后阻滞了锌液的流动,形成了宏观麻点缺陷形貌。Causes of pitting defects on hot-rolled galvanized steel sheet were studied by means of systematic surface examination,detailed microstructure analysis and precise chemical composition testing.The results show that aberrant dew point conditions within the annealing furnace lead to an insufficiently reducing atmosphere,which induces the oxidation and formation of iron oxide on the surface of the steel sheet,so that the surface wettability of hot-rolled substrate is insufficient during galvanizing,thereby impeding the formation of the Fe-Al inhibition layer and leading to pinhole leakage in the zinc coating.These pinhole leakages disrupt the flow of the zinc liquid after the steel sheet is discharged the zinc pot,eventually manifesting as visible pitting defects on a macroscopic scale.

关 键 词：热基镀锌 麻点缺陷 针孔漏镀 

分 类 号：TG174.443[金属学及工艺—金属表面处理]