The galvanized wire rod is first pickled and iron oxide is used to remove the surface of the wire. After pickling, it passes through a cleaning tank solution or a mixed aqueous solution of ammonium chloride or zinc chloride and zinc chloride, and then enters the hot dip tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
The hot-dip galvanized wire rod undergoes a complex physical and chemical reaction with the molten pool to form a dense layer of corrosion-resistant zinc-iron alloy structure. The alloy layer is integrated with the pure zinc layer and the iron wire substrate. Therefore, its corrosion resistance is strong.
The cold galvanized wire is galvanized, and the galvanization is very little, only 10-50g/m². The corrosion resistance of its own hot-dip galvanized wire is much different. Most of the regular galvanized steel wire manufacturers do not use electro-galvanized (cold plating) in order to ensure quality.
Only those small, outdated equipment and small companies using electro-galvanized zinc, of course their prices are relatively cheap. The galvanized layer of cold galvanized wire is an electroplated layer, an independent layered zinc layer and an iron wire substrate. A thin layer of zinc, the zinc layer simply adheres to the iron wire substrate and is easy to fall off. Therefore, its corrosion resistance is poor. In a new house, cold water galvanized iron wire is prohibited.