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Galvanized steel plate is to prevent the surface of the steel plate from being corroded and prolong its service life, and the surface of the steel plate is plated with a layer of metal zinc.
According to the production and processing methods, it can be divided into the following categories:
1. Hot-dip galvanized steel sheet. A steel sheet is dipped into a bath of molten zinc and a piece of zinc is adhered to its surface. At present, it is mainly produced by the continuous galvanizing process, that is, the galvanized steel sheet is made by continuously immersing the rolled steel sheet in a bath of molten zinc;
2. Alloy galvanized steel sheet. This kind of steel plate is also made by hot dip method, but it is heated to about 500 ℃ immediately after being out of the can to form a zinc-iron alloy film. This galvanized sheet has good paint adhesion and weldability;
3. Electro-galvanized steel. The galvanized steel sheet produced by the electroplating method has good workability. However, the coating is thin, and the corrosion resistance is not as good as that of hot-dip galvanized sheet;
4. Single- and double-sided differential galvanized steel. Single-sided galvanized steel sheet, that is, a product with only one side galvanized. In welding, painting, anti-rust treatment, processing, etc., it has better adaptability than double-sided galvanized sheet. In order to overcome the disadvantage that one side is not galvanized, another galvanized sheet is plated with a thin layer of zinc on the other side, that is, double-sided differential galvanized sheet;
5. Alloy, composite galvanized steel sheet. It is made of zinc and aluminum, lead, zinc and other metals alloys or even composite plated steel. This kind of steel plate not only has excellent anti-rust performance, but also has good coating performance;