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Cooling method of zinc layer during hot-dip galvanizing
Release time:2020-08-07 15:44:39      The number of clicks:60

After the steel wire is drawn from the zinc pot, its temperature gradually decreases. On the one hand, the zinc liquid on the surface of the steel wire will be oxidized by oxygen in the air to form ZnO, and on the other hand, it will continue to interact with the iron in the steel wire matrix to make the alloy layer thicker. This is undesirable, so the steel wire should be forced to cool immediately after it is drawn out. There are two methods of forced cooling, air cooling and water cooling, or both. Before the zinc layer is completely solidified, the steel wire should not be in contact with the stabilizing roller of the vertical lead frame.

The forced cooling on the vertical lead frame is 300-400mm from the zinc liquid surface of the steel wire. The wiping is done with oil charcoal above the vertical lead frame. The wiping force is very small, and the pure zinc layer obtained is thicker and more uniform. In this respect, the vertical lead method is better than the diagonal lead method hot-dip galvanizing.

During vertical hot-dip galvanizing, a layer of oil charcoal particles with a thickness of 5-8cm is often used to cover the steel wire out of the zinc liquid surface. This layer of oil charcoal particles has two functions:

(1) It is a tool for wiping the zinc layer. When the steel wire passes through the oil charcoal layer, the zinc liquid on its surface can become smooth and bright by wiping it.

(2) It can prevent oxidation of the zinc liquid surface at the steel wire outlet and the surface of the steel wire. The protective effect of the oil charcoal layer is because the oil forms a local reducing atmosphere when it is decomposed and carbonized at high temperature.


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