Galvanized pipe is made of molten metal and iron-based alloy layer body reaction, so that the substrate and coating combination of both. Hot dip galvanized steel pipe is the first for pickling, in order to remove the steel surface of iron oxide, acid, the aqueous solution by ammonium chloride or zinc chloride or ammonium chloride and zinc chloride mixed aqueous solution tank cleaning, and then send into the hot-dip tank. Hot dip galvanized with coating uniformity, strong adhesion and long life.
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