How is the zinc layer of galvanized steel grating formed?

Galvanized steel grating is a kind of steel grating and is widely used. During the production process of galvanized steel grating, a layer of zinc will be formed on the surface. Then, how is the zinc layer formed? When the steel grating workpiece is immersed in molten zinc, it first forms a solid solution with a iron (body-center) at the interface.At this time, the metal iron of the steel grating base is dissolved with zinc atoms in a solid state to form a crystal. The two metal atoms are fused, and the attraction between the atoms is relatively small. When the zinc reaches saturation in the solid solution, the zinc and iron The two kinds of atoms are dispersed in each other, and the zinc atoms dispersed in the iron matrix of the steel grid plate move in the matrix lattice, and gradually form an alloy with iron.

The iron dispersed in the molten zinc liquid forms the intermetallic compound FeZn13 with zinc, which sinks to the bottom of the hot-dip galvanizing pot, which is zinc slag. When the steel grating workpiece is removed from the zinc liquid, the surface forms a pure zinc layer, which is a hexagonal crystal, and its iron content is not more than 0.003%. The process of forming an iron-zinc alloy between layers, the steel grating workpiece forms an iron-zinc alloy layer during hot-dip galvanizing, which makes the iron and pure zinc layer well combined.

Post time: Apr-06-2022