Galvanized layer formation process
Date:2016-12-20 View(s):1950 Tag:hot-dip galvanizing ,galvanized steel pipe,prime steel
The formation of hot-dip galvanizing layer is the process of iron-zinc alloy formation between the iron matrix and the outermost pure zinc layer. The surface of the workpiece forms an Fe-Zn alloy layer on hot dip plating, which makes the , The process can be simply described as: when the iron workpiece immersed in molten zinc liquid, the first interface in the formation of zinc and α iron (body) solid solution. This is the matrix metal iron in the solid state dissolved zinc atoms formed by a crystal, between the two metal atoms are fused, the atomic force between the relatively small. Therefore, when the zinc in the solid solution to saturation, the two elements of zinc and iron atoms spread to each other, diffusion (or infiltration) into the iron matrix of zinc atoms in the matrix lattice migration, and gradually form an alloy with iron, and diffusion To the molten zinc liquid and zinc to form intermetallic compounds FeZn13, sink into the bottom of the hot-dip galvanizing, that is, dross. When the workpiece from the zinc immersion liquid out of the surface layer of pure zinc, hexagonal crystal. The iron content of not more than 0.003%.
