Hot-dip galvanized steel pipe is a kind of steel pipe to improve the corrosion resistance, the general steel pipe galvanized. Galvanized steel pipe hot galvanized and galvanized two, hot galvanized galvanized layer thickness, galvanized low cost, the surface is not very smooth. Then hot galvanized steel pipe is what kind of it? Next by the small series introduced hot galvanized steel pipe:
1. uniformity of the galvanized layer: steel pipe sample in the copper sulfate solution for 5 times can not be red.
2. Surface quality: galvanized steel pipe surface should be a complete galvanized layer, Hot-dipped Galvanzied Steel Pipe there must be no plating of dark spots and bubbles exist, allowing little rough surface and local zinc tumor exists.
3. Zinc plating weight: According to the demand side, galvanized steel pipe can be used for zinc layer weight determination, the average should not be less than 500g / square meter, Hot-dipped Galvanzied Steel Pipe any sample shall not be less than 480g / square meter.
The hot-dip galvanized steel pipe is a reaction between the molten metal and the iron matrix to produce an alloy layer, so that both the substrate and the coating are combined. Hot-dip galvanizing is the first pickling of steel pipe, in order to remove iron oxide on the surface of the steel pipe, pickled, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed water tank cleaning, Hot-dipped Galvanzied Steel Pipe and then sent Hot dip bath. Hot galvanized with uniform coating, strong adhesion, long life and other advantages.
Steel pipe matrix and molten bath complex physical and chemical reactions, the formation of corrosion-resistant structure of a dense zinc alloy layer. Alloy layer and pure zinc layer, steel pipe body integration. So its strong corrosion resistance.