Galvanizing can increase the corrosion resistance of steel pipe and prolong its service life. Most of the old houses are made of galvanized pipes. Now the iron pipes for gas and heating are also galvanized pipes.
Galvanized pipe uses are wide. It is widely used for water, gas, oil and other general low-pressure fluid pipelines. Besides, the galvanized pipe is also used for oil well pipes and oil pipes in petroleum industry, especially in offshore oil fields, oil heaters, condensing coolers, coal distillate wash oil exchangers in chemical coking equipment, trestle pipe piles, support frame pipes in mine tunnels, etc.
Galvanized pipe is corrosion-resistant. Zinc oxide is dense and can prevent further oxidation. Moreover, the electrode potential of zinc is higher than that of iron, which can prevent electrochemical corrosion. Zinc is also known as "the skin of steel".
Hot dip galvanized pipe is to make molten metal react with iron matrix to produce alloy layer, so that the matrix and coating are combined. 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 cleaned by ammonium chloride or zinc chloride aqueous solution or the mixture of ammonium chloride and zinc chloride aqueous solution tank, and then it is sent into the hot dip galvanizing tank. The complex physical and chemical reactions between the hot dip galvanized steel pipe matrix and the molten bath form a zinc iron alloy layer with a close corrosion-resistant structure. The alloy layer is integrated with pure zinc layer and steel pipe matrix, so it has strong corrosion resistance.
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