Steel Technological

Small spangle galvanized sheet

 Small spangle galvanized sheet
Due to the large crystals of zinc spangle spent zinc layer is thicker edge, the core portion is thinner, so big spangle galvanized sheet surface uneven, is not suitable for painting or coating, because the paint area are still emerging spangle affect the appearance of the steel sheet contour. In addition, due to the large spangle coating corrosion resistance poor tend to use the appearance of even small spangle galvanized sheet. To do this, change strip drawn from the cooling when the zinc pot, you can adjust the zinc layer crystalline state, allowing for small spangle. For large strip continuous hot-dip galvanizing line is often used to blow liquid zinc layer surface water - vapor or water - air mixture and a method to obtain a small spangle. When a large number of fine mist of water dripping on the surface of the liquid zinc layer, so that nuclei increase and accelerate the solidification of liquid zinc layer, shortening the time of its crystal growth to obtain a fine spangle crystal (2-3mm or less in diameter) .
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