Analysis and control of nodules and coating shedding on surface of hot-dip galvanized low-carbon steel wire
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 local-ized 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 recom-mended 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.
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