First, hot galvanized pipe is to make molten metal react with iron substrate to produce alloy layer, so that the substrate and the two layers of coating are combined. The hot dip galvanizing is first to wash the steel tube, in order to remove the iron oxide on the surface of the steel tube. After pickling, it is cleaned by the solution of ammonium chloride or zinc chloride or ammonium chloride and zinc chloride in the mixed solution tank, and then sent into the hot dip bath. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. In the north, zinc plating process is used in most of the processes.
Two, cold galvanized pipe, cold galvanizing is galvanized, zinc content is very small, only 10-50g/m2, its own corrosion resistance than hot galvanized tube difference. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use galvanized. Only those small and outdated small businesses use zinc plating, of course, their prices are relatively cheaper. In the future, cold galvanized pipes are not allowed to be used as water and gas pipes. The zinc layer is an electroplating layer, and the zinc layer is separately separated from the steel tube substrate. The zinc layer is thin, and the zinc layer is simply attached to the steel tube substrate, so it is easy to fall off. Therefore, its corrosion resistance is poor. In new buildings, cold galvanized steel pipes are not allowed to be used as water pipes.
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