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The factors affecting the performance of hot-dip galvanized layer

2018-08-03

In the hot dip galvanizing process, the main influencing factors are:
(1) Zinc temperature and immersion time
In the normal galvanizing temperature range (445 to 465 ° C), increasing the temperature of the zinc liquid can increase the fluidity of the zinc liquid. Thereby, the surface quality of the zinc layer can be improved and the reflow of the zinc liquid can be improved, and the weight of the plating layer can be reduced. In addition, the galvanizing time can be shortened and the production efficiency of the zinc pot can be improved. However, the galvanizing temperature is too high, which may cause deformation of the steel pipe.
During hot dip galvanizing, the zinc bath temperature (or galvanizing temperature) and immersion time have an important effect on the galvanized layer. The iron loss at the time of galvanizing is usually used as a parameter of the reaction rate of Fe-Zn. Iron loss refers to the total amount of iron in which iron and zinc react to form an alloy layer and the exfoliated portion of this layer becomes iron in the dross.
(2) Steel matrix chemical composition
a. Effect of carbon Generally speaking, the higher the carbon content in steel, the stronger the Fe-Zn reaction, the greater the iron loss, and the thicker the alloy layer formed.
b. Influence of silicon The influence of silicon in steel on hot-dip galvanizing is most prominent. Ordinary carbon steel contains a small amount of silicon.
c. Effect of copper Due to ore raw materials, some ordinary carbon steel may contain a small amount of copper, and a small amount of copper has no obvious influence on the structure of the galvanized layer. The hot-dip galvanized layer of the copper-containing steel has good atmospheric corrosion resistance.
d. Effects of manganese, sulfur and phosphorus Common low carbon steels contain a certain amount of manganese and a small amount of sulfur and phosphorus. In general, manganese and sulfur have no significant effect on the structure of the galvanized layer.

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