Galvanized sheet is a steel plate coated with a layer of zinc. Zinc plating is an economical and effective anticorrosion method, and about half of the world zinc production is used in this process.
According to the method of production and processing, it can be divided into the following categories:
1.Hot dip galvanized steel plate. To immerse a thin steel plate into a molten zinc tank and to attach a layer of zinc to its surface. At present, the continuous galvanizing process is mainly used, that is, the rolled steel plate is continuously immersed in the galvanized bath to make the galvanized steel plate.
2. alloyed galvanized steel plate. This kind of steel plate is also made by hot dip method, but it is heated to about 500 ℃ immediately after the tank is out to form zinc and iron alloy film. The galvanized sheet has good coating compactness and weldability.
3. galvanized steel plate. The galvanized steel plate made by electroplating has good processability. However, the coating is thinner and less corrosion-resistant than hot-dip galvanized sheet.
4. Single side galvanized steel plate and double side differential galvanized steel plate. Single side galvanized steel plate, that is, only on one side of the product galvanized. In welding, coating, rust-proof treatment, processing and other aspects, than double-sided galvanized sheet has a better adaptability.
In order to overcome the shortcomings of unzinc-coated on one side, there is another kind of galvanized plate coated with thin layer zinc on the other side, that is, double-sided differential galvanized plate.
5. alloy, composite galvanized steel plate. It is made of zinc and other metals such as aluminum, lead, zinc, etc. This kind of steel plate not only has excellent antirust performance, but also has good coating performance.
In addition to the above five, there are color galvanized steel plate, printed galvanized steel plate, polyvinyl chloride laminated galvanized steel plate and so on. But the most commonly used galvanizing plate is still hot dip galvanizing.
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