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What causes the zinc layer on the surface of the hot-dip galvanized steel grating to fall off?

Galvanized steel gratings can be divided into hot-dip galvanized steel gratings and cold-galvanized steel gratings according to different galvanizing processes. Hot-dip galvanized steel gratings are better than cold-galvanized steel in service life and corrosion resistance. Geometry. However, sometimes the hot-dip galvanized steel grating will also have a surface zinc layer falling off. What is the reason?
1. The steel content of the steel grid steel alloy layer is small, and no reasonable alloy layer which determines the adhesion of the zinc layer is formed, or the alloy layer is destroyed by the excessively grown iron-zinc alloy layer.
Second, the surface of the steel grating is provided with an iron oxide layer, and the sponge-like pure iron required for the substrate in the annealing furnace is not completely reduced to the zinc plating, which can also cause the zinc layer to fall off.
3. The steel grating retains foreign particles during the surface galvanizing treatment, and is not removed when invading the zinc pot, so that zinc is affected.
The above is the reason why the steel grating manufacturer Baoxu finishing will cause the zinc layer on the surface of the hot-dip galvanized steel grating to fall off. In order to avoid the occurrence of such problems in hot-dip galvanized steel gratings, we should pay attention to the cleanliness of the surface when hot-dip galvanized steel gratings, and comprehensively grasp the various attentions during hot-dip galvanizing. problem.
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