镀铝锌钢板表面锌花均匀性分析  

Analysis of the uniformity of spangle on the surface of Al-Zn alloy coated steel

作　　者：丁志龙[1] 闫秉昊 张启富[2] DING Zhilong;YAN Binghao;ZHANG Qifug(Research Institute,Baoshan Iron&.Steel Co.,Ltd.,Nanjing 210039,Jiangshu,China;National Engineering Laboratory of Advanced Coating Technology for Metals,Central Iron and Steel Research Institute,Beijing 10o081,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,江苏南京210039 [2]钢铁研究总院先进金属材料涂镀国家工程实验室,北京100081

出　　处：《四川冶金》2024年第6期45-49,共5页Sichuan Metallurgy

基　　金：国家重点研发计划课题(2017YFB0304305)。

摘　　要：对镀铝锌钢板表面锌花大小均匀性进行分布调查,开展了表面锌花形貌及化合物层、镀层元素深度分布和轧硬板表面R-C-OO-Fe的分析。结果发现:钢板板宽中部800 mm位置内锌花细小,小锌花形核中心处Zn元素含量高于正常锌花,镀层中间位置正常锌花镀层中Zn含量比小锌花镀层中Zn含量高,分析出造成锌花不均原因为R-C-OO-Fe粘附到钢板表面,热浸镀前的碱洗工艺无法去除,提出了Fe过多扩散到镀层中导致镀层凝固形核率增加的形核机制。Conduct a survey on the uniformity of spangle size distribution on the surface of aluminum-zinc coated steel plates and conducted analysis on the morphology and compound layer of surface spangle,the depth distribution of coating elements,and the R-C-OO-Fe surface of rolled hard plates.The results showed that the spangle in the middle 800 mm of the steel plate is small,and the Zn element content at the center of the small spangle nucleus is higher than that of the normal spangle.The Zn content in the normal zinc flower coating at the middle position of the coating was higher than that in the small spangle coating.The reason for the uneven spangle is analyzed to be that R-C-OO-Fe adhered to the surface of the steel plate,and the alkaline washing process before hot-dip coating could not remove it.A nucleation mechanism was proposed,in which excessive diffusion of Fe into the coating increased the solidification nucleation rate of the coating.

关 键 词：铝锌镀层 锌花均匀性 形核机制 

分 类 号：TG174.443[金属学及工艺—金属表面处理]