The hot-dip galvanized pipe is the reaction of molten metal with the iron-based body to produce the alloy layer, so that the substrate and the coating are combined together.
Hot Dip Galvanizing is the first steel pipe pickling, in order to remove iron oxide on the surface of steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed water solution tank in the cleaning, and then into the hot dip bath. Hot-Dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
Hot-dip galvanized steel pipe substrate and molten plating liquid occur complex physical and chemical reaction, forming a corrosion-resistant structure of a dense zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. So its corrosion resistance is strong.
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