Hot Dip galvanizing is also called hot dip galvanizing, which is a method to obtain metal covering layer in molten zinc solution of steel component. With the rapid development of high-voltage power transmission, transportation and communications, the protection requirements for steel parts are more and more high, and the demand for hot dip galvanizing is increasing.
The forming process of hot dip galvanizing layer is the process of forming Fe-Zn alloy between the iron-based body and the outermost pure zinc layer, and the workpiece surface forms iron-zinc alloy layer during hot dip plating, so that the iron and pure zinc layer between the good combination of the process can be simply described as: when the metal parts immersed in molten zinc, first in the interface to form zinc and α-iron (body heart) solid melt. This is the matrix of metal iron in the solid state of the dissolution of zinc atoms formed a crystal, the two metal atoms are fused, the gravitational pull between atoms is relatively small. Therefore, when the zinc is saturated in the solid melt, the two elements of zinc and iron are mutually diffused, the zinc atoms that diffuse to (or are called into) a iron-based body migrate in the matrix lattice, gradually forming an alloy with iron, and the iron diffused into the molten zinc solution forms a intermetallic compound with zinc and sinks into the bottom of the hot-dip galvanizing pot, which is zinc slag. When the workpiece is removed from the dipping zinc solution, the surface forms a pure zinc layer.
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