The application of Hot Dipped Galvanized Steel Pipe

　　Hot-dip galvanized pipe is to make molten metal react with iron substrate to produce alloy layer, so that the substrate and the two 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 galvanized steel pipe has the advantages of uniform coating, strong adhesion and long service life. There is complex physical and chemical reaction between the steel tube matrix and the molten bath, forming a corrosion resistant structure of zinc iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel tube substrate. Therefore, its corrosion resistance is strong.

　　Now gas, greenhouse, the kind of iron pipe used for heating is also galvanized pipe, the galvanized pipe as a pipe, a large amount of rust in the pipe, the effluent from the yellow water not only pollution sanitary ware, but also mixed with the smooth inner wall of bacteria, corrosion caused heavy metal content in the water, seriously endangering the health of the human body. In 60s and 70s, the developed countries began to develop new types of pipes and banned galvanized pipes one after another. The four ministries and commissions, such as the Ministry of construction of China, also make sure that the galvanized pipes have been banned from the two 000 years. At present, galvanized pipes have been rarely used in the cold water pipes of the newly built communities, and some hot water pipes in some communities use galvanized pipes.