galvanizedsteel pipe can be divided into the cold galvanized pipe, galvanized pipe.Galvanized pipe is to make the molten metal and the body reaction, iron-based alloy layer, so that the substrate and coating combination of both. Hot dip galvanized steel pickling is the first, in order to remove the steel surface of iron oxide, pickling, the aqueous solution by ammonium chloride or zinc chloride or ammonium chloride and zinc chloride mixed solution tank cleaning, and then send into the hot-dip plating bath. Hot-dip galvanized with coating uniformity, adhesion, and long life. Hot dip galvanized steel substrate occurs with molten bath complex physical, weldedsteel pipe should form a corrosion-resistant structure of zinc-iron alloy layer close. Alloy layer and the layer of pure zinc, steel base blend. Therefore, its corrosion resistance ability.differenceof welded steel pipe is galvanized, galvanized rarely, and only 10-50g/m2, its own hot dip galvanized pipe corrosion resistance than a lot of difference. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanized (cold plating).We often say that the weldedpipe cold crack, galvanized pipe use now gas, heating with the kind of iron pipe is galvani
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