热基镀锌钢板表面麻点缺陷分析

doi:10.13251/j.issn.0254-6051.2024.10.045

金属热处理 ›› 2024, Vol. 49 ›› Issue (10): 278-283.DOI: 10.13251/j.issn.0254-6051.2024.10.045

热基镀锌钢板表面麻点缺陷分析

李士明^1,2, 张杰^1,2, 刘昕^1,2, 张子月¹, 陈斌锴^1,2, 张启富^1,2

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

收稿日期:2024-05-15 修回日期:2024-08-26 出版日期:2024-11-28 发布日期:2024-11-28
作者简介:李士明(1988—),男,高级工程师,博士研究生,主要研究方向为热镀锌板镀层组织性能与工艺,E-mail: mingshili2006@126.com

Analysis on surface pitting defects of hot-rolled galvanized steel sheet

Li Shiming^1,2, Zhang Jie^1,2, Liu Xin^1,2, Zhang Ziyue¹, Chen Binkai^1,2, Zhang Qifu^1,2

1. National Engineering Lab of Advanced Coating Technology for Metallic Material, Central Iron & Steel Research Institute Co., Ltd., Beijing 100081, China;
2. CISRI Engineering Design Co., Ltd., Beijing 100081, China

Received:2024-05-15 Revised:2024-08-26 Online:2024-11-28 Published:2024-11-28

摘要/Abstract

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。

关键词: 热基镀锌, 麻点缺陷, 针孔漏镀

Abstract: 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.

Key words: hot-rolled galvanizing, pitting defects, pinhole leakage

中图分类号:

TG174.443

李士明, 张杰, 刘昕, 张子月, 陈斌锴, 张启富. 热基镀锌钢板表面麻点缺陷分析[J]. 金属热处理, 2024, 49(10): 278-283.

Li Shiming, Zhang Jie, Liu Xin, Zhang Ziyue, Chen Binkai, Zhang Qifu. Analysis on surface pitting defects of hot-rolled galvanized steel sheet[J]. Heat Treatment of Metals, 2024, 49(10): 278-283.

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热基镀锌钢板表面麻点缺陷分析

Analysis on surface pitting defects of hot-rolled galvanized steel sheet

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