Galvanized pipes are mainly divided into cold-plated pipes and hot-dip pipes, and we are using hot-dip galvanized steel pipes as the greenhouse frameworks.

Hot-dip galvanized pipe

The hot-dip galvanized pipe is obtained by reacting a molten metal with an iron matrix to produce an alloy layer, the amount of galvanizing is normally over 275g/m²，thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. The steel pipe matrix and the molten plating solution undergo complex physical and chemical reactions to form a corrosion-resistant structure of a zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.