Principle of hot-dip galvanizing formation
Sep 19,2024
The process of forming an iron-zinc alloy between the iron matrix and the outermost pure zinc layer, the surface of the workpiece formed an iron-zinc alloy layer during hot dip plating, so that the iron and pure zinc layer is well combined, the process can be simply described as: when the iron workpiece is immersed in the molten zinc liquid, the first zinc and α-iron (body-centered) solid melt is formed on the interface. This is a crystal formed by the matrix metal iron dissolved with zinc atoms in a solid state, and the two metal atoms are fused, and the gravitational attraction between the atoms is relatively small. Therefore, when zinc reaches saturation in the solid melt, the two elements of zinc and iron atoms diffuse each other, the zinc atoms diffused into (or infiltrated into) the iron matrix migrate in the matrix lattice, and gradually form an alloy with iron, and the iron diffused into the molten zinc liquid forms an intermetallic compound FeZn13 with zinc, which sinks into the bottom of the hot galvanized pot, that is, zinc slag. When the workpiece is removed from the zinc leaching solution, the surface of the pure zinc layer is formed, which is hexagonal crystal. Its iron content is not greater than 0.003%.
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