Galvanized pipes are widely used in construction, machinery, coal mining, chemical industry, electric power, railway vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, exploration machinery, greenhouse construction and other manufacturing industries.
Welded steel pipe with hot-dip or electro galvanized coating on the surface of galvanized steel pipe. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized pipe is widely used. In addition to being used as pipeline pipe for water transmission, gas, oil and other general low-pressure fluids, it is also used as oil well pipe and oil transmission pipe in petroleum industry, especially in offshore oil fields, oil heater, condensate cooler and coal distillation oil washing exchanger of chemical coking equipment, trestle pipe pile, support frame pipe of mine tunnel, etc.
Hot dip galvanized pipe is to make molten metal react with iron matrix to produce alloy layer, so as to combine the matrix and coating. Hot dip galvanizing is to pickle the steel pipe first. In order to remove iron oxide on the surface of the steel pipe, after pickling, it is cleaned in ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions occur between the galvanized pipe matrix and the molten bath to form a corrosion-resistant zinc ferroalloy layer with compact structure. The alloy layer is integrated with pure zinc layer and steel pipe matrix, so it has strong corrosion resistance.