Analysis and control of nodules and coating shedding on surface of hot-dip galvanized low-carbon steel wire
WANG Haibin1,2, LI Kunfeng3, JIA Jianping1, WANG Jianzhong1,2, DI Zengwen1, SONG Renbo3
1. Xuansteel Company, HBIS Group, Xuanhua 075100, Hebei, China; 2. Hebei Steel Engineering Technology Research Center for Steel Structure, Xuanhua 075100, Hebei, China; 3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Aiming at the problem of zinc nodule and coating shedding on the surface of hot-dip galvanized low-carbon steel wire, the causes were analyzed by X-ray photoelectron spectroscopy, scanning electron microscopy and energy spectrometer, then the control measures were put forward. The results show that zinc nodules originate from localized thickening of the coating, which due to the reaction of residual Si-containing oxides on the surface of the raw material wire with the zinc to produce the "Sandelin effect". The shedding of the coating is due to the excessive growth of alloy layer with poor plasticity due to the long immersion time of the steel wire. Therefore, it is recommended to strictly control the heating and pickling process to remove oxide residues on the surface of the steel wire. At the same time, a certain amount of nickel and aluminum can be added to the zinc pot to inhibit the occurrence of the "Sandelin effect" and the excessive growth of the alloy layer. The research results are of great significance for improving product quality and realizing product upgrading.
王海宾, 李坤峰, 贾建平, 王建忠, 狄增文, 宋仁伯. 热浸镀锌低碳钢丝表面结瘤及镀层脱落分析及控制[J]. 中国冶金, 2024, 34(2): 134-141.
WANG Haibin, LI Kunfeng, JIA Jianping, WANG Jianzhong, DI Zengwen, SONG Renbo. Analysis and control of nodules and coating shedding on surface of hot-dip galvanized low-carbon steel wire[J]. China Metallurgy, 2024, 34(2): 134-141.
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2024, Vol. 34 
