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.
Cold galvanizing is electrogalvanizing with little amount of galvanizing, only 10 - 50g/m2, and its corrosion resistance is much different from that of hot dip galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most of the use of galvanizing. Only small businesses with old equipment are galvanized, and of course their prices are relatively cheap.
Now the general galvanized steel pipe is used in hot galvanizing, and electrical use trough etc. with the cold galvanized, color has certain difference, only in the cold plating tube wall galvanized, hot dip galvanized welded pipe inside and outside plating is based on reheat welded steel pipe galvanized, the outer and inner walls with steel tube when there is a layer of zinc layer, galvanized pipe commonly used for conveying low pressure fluid.
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