The most widely used steel materials in industry can be corroded in different degrees when used in the environment of atmosphere, seawater, soil and building materials. According to statistics, the world's annual corrosion loss of steel materials about 1/3 of its total production. In order to guarantee the normal use of steel products and prolong their service life, the anti-corrosion protection technology of steel has been paid more and more attention by people.
Hot-dip Galvanizing is one of the most effective means to postpone the corrosion of steel material environment, it is the surface after cleaning, activated steel products immersed in molten zinc, through the reaction between iron and zinc and diffusion, the steel products on the surface of a good adhesion of zinc alloy plating. Compared with other methods of metal protection, the bonding strength of the coating and the substrate, the compactness of the coating, durability, maintenance-free and economy and its adaptability to the shape and size of the product are incomparable advantages on the protection characteristic of the physical barrier of the coating and the electrochemical protection. Hot-dip galvanized products are mainly steel plate, steel strip, wire, steel pipe and so on, of which hot-dip galvanized steel sheet accounted for the largest proportion. For a long time, hot-dip galvanizing process has attracted people's favor because of its low plating cost, excellent protection property and beautiful appearance, and it is widely used in automobile, construction, home appliance, Chemical industry, machinery, petroleum, metallurgy, light industry, transportation, electric power, aviation and ocean engineering and other fields.
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