Hot Dip Galvanized Steel Coil
Hot Dip Galvanized Steel Coil is a method of metal coating layer steel structures immersed in the molten zinc was obtained. In recent years, with the development of high-voltage transmission, transportation, communications industry rapid , the requirement of protection of the steel parts has become increasingly , the demand of hot-dip galvanizing is increasing too.
the galvanized layer thickness is often range 5 ~ 15μm, but the hot-dip galvanizing layer is generally 35μm or more, even up to 200μm. Galvanized coverage is excellent, dense coating, organic-free inclusions. As we all know, under the conditions of atmospheric corrosion of zinc coating surface ZnO, the mechanism of resistance to atmospheric corrosion of zinc mechanical protection and electrochemical protection is slow down the corrosion of zinc Zn (OH) 2 and basic zinc carbonate protective film, to a certain extent, this layer protective film (also known as white rust) damage will form a new film. Iron matrix will be threatened When the zinc layer severely damaged.Then,the matrix of zinc to produce electrochemical protection, zinc standard potential -0.76V, -0.44V standard potential of iron, zinc and iron to form micro-zinc battery as the anode are dissolved iron as the cathode is protected. Clearly galvanized resistance to atmospheric corrosion of the base metal than galvanized iron.
With the development of industrial, hot dip galvanized steel coil products have been applied to many fields, hot dip galvanized has been a very popular anti-corrosion treatment since it have a big advantages in anti-corrosion ,and wide adaptation. It’s widely used with the power tower, communication tower, railway, highway protection, light poles, marine components, steel building components, substation ancillary facilities and light industry.
Hot-dip galvanizing have a long time anti-corrosion, but it anti-corrosion life is not the same in a different environment: heavy industry for 13 years, 50 years, ocean, 104 years on the outskirts of the city for 30 years.
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