The hot-dip galvanizing tube is to make the molten metal react with the iron matrix to produce the alloy layer, so that the matrix and the two layers of the coating are combined. Hot dip galvanizing is to pickle steel pipes first, then remove iron oxides on the surface of steel pipes, then pickle them, then clean them through ammonium chloride or zinc chloride water solution or ammonium chloride and zinc chloride mixed water solution tank, then send them into hot dip bath.
The hot-dip galvanized pipe has the advantages of uniform coating, strong adhesion, long service life and so on. The complex physical and chemical reactions occurred between the steel tube matrix and the molten plating bath to form a corrosion-resistant and tightly structured zinc - iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel tube matrix. Therefore, its corrosion resistance is strong.
1, the uniformity of the galvanized layer: the steel tube specimen is impregnated continuously for 5 times in the copper sulfate solution and must not be reddened.
2, the surface quality: the surface of galvanized steel pipe should have a complete zinc coating. There must be no black spots and bubbles on the surface, allowing for little rough surface and localized zinc tumor.
3, zinc coating weight: according to the requirements of the buyer, the galvanized steel pipe can be used for the determination of the zinc layer weight, the average value should not be less than 500g/ square meters, and any sample shall not be less than 480g/ square meters.
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