[1]李 黎*,郭 远,郭志飞,等.doi: 10.3969/j.issn.1001-3849.2025.08.011热镀锌S350GD大锌花表面亮点缺陷原因[J].电镀与精饰,2025,(08):70-75.
　Li Li*,Guo Yuan,Guo Zhifei,et al.Analysis of the cause of bright spot defects of S350GD with large zinc flower and improvement measures[J].Plating & Finishing,2025,(08):70-75.
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doi: 10.3969/j.issn.1001-3849.2025.08.011热镀锌S350GD大锌花表面亮点缺陷原因()

《电镀与精饰》[ISSN:1001-3849/CN:12-1096/TG]

卷:
期数:
2025年08
页码:
70-75
栏目:
出版日期:
2025-08-31

文章信息/Info

Title:
Analysis of the cause of bright spot defects of S350GD with large zinc flower and improvement measures
作者:
李 黎1; 2*; 郭 远1; 郭志飞2; 刘鸣凤1; 李进存3
分析及改进措施李 黎1,2*,郭 远1,郭志飞2,刘鸣凤1,李进存3(1. 邵阳技师学院 机械工程中心,湖南 邵阳 422000 ;2. 首钢技术研究院,北京 100041 ;3. 青岛四方阿尔斯通铁路运输设备有限公司,山东 青岛 266000)
Author(s):
Li Li1; 2*;  Guo Yuan1;  Guo Zhifei2;  Liu Mingfeng1;  Li Jincun3
(1. Mechanical Engineering Center, Shaoyang Technician College, Shaoyang 422000, China; 2. Shougang Technology Institute, Beijing 100041, China; 3. Alstom Sifang (Qingdao) Transportation Ltd., Qingdao 266000, China)
关键词:
大锌花; 亮点; 结瘤; 凹坑; 选择性氧化; 露点
Keywords:
large zinc flower;  bright spot;  nodulation;  pit;  selective oxidation;  dew point
分类号:
TG178
文献标志码:
A
摘要:
针对热镀锌S350GD大锌花表面亮点缺陷，采用扫描电镜、能谱仪分别对亮点缺陷微观形貌、微观成分及去除亮点镀层后的基板形貌进行观察分析。结果表明：由于炉辊结瘤微颗粒在带钢表面形成凹坑，凹坑内部锌液在气刀吹扫作用下，从涡脱落区喷出，导致镀层厚度减薄，从而使得缺陷形貌为凹坑状；凹坑内镀层表面未被光整到，镀层表面粗糙度更小，容易反射光线，肉眼看起来更为明亮而形成亮点缺陷；凹坑破坏了带钢表面形成的Fe与Fe的氧化物，使得内氧化形成的Mn及Mn的化合物裸露在外，裸露区域对锌液浸润性差，从而凹坑内部镀层形成漏镀缺陷；可从合理选择炉辊涂层、优化炉内张力和辊型及控制炉内气氛与露点等方面来减少和控制炉辊结瘤，改进亮点缺陷。
Abstract:
In order to find the cause of the surface defect of hot-dip galvanized S350GD with large zinc flower, the-morphology, micro-component and the morphology of the substrate after removing the bright spot coating were observed and analyzed by scanning electron microscopy and energy dispersive spectrometer. The results show that the bright spot defect is caused by the formation of pits on the surface of the strip due to the nodulationr of the furnace roller, and the zinc liquid the pit is blown out from the vortex shedding area under the action of the air knife, resulting in the thinning of the coating thickness, thus the defect morphology is-shaped; the surface of the coating in the pit is not polished, the surface roughness of the coating is smaller, and it is easy to reflect light, which brighter to the naked eye and forms a bright spot defect; the pit destroys the Fe and Fe oxides formed on the surface of the strip, which makes the Mn and Mn compounds formed by internal oxidation exposed to the outside, and the exposed area has poor invasive with zinc liquid, resulting in the formation of a missing coating defect the pit; the nodulation of the furnace roller can be reduced and controlled from the aspects of reasonable selection furnace roller coating, optimizing the tension and roller shape in the furnace and controlling atmosphere and dew point in the furnace

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更新日期/Last Update: 2025-08-11