Galvanized sheet refers to a steel sheet coated with a layer of zinc on the surface. Galvanizing is an economical and effective anti-rust method that is often used. About half of the world’s zinc production is used in this process.
The role of galvanized sheets
Galvanized steel panels are coated with a layer of metallic zinc on the surface of the steel panels to prevent corrosion on the surface and extend its service life. This zinc-coated steel panel is called a galvanized panel.
It can be divided into the following categories according to production and processing methods:
①Hot-dip galvanized steel plate. A thin steel plate is immersed in a bath of molten zinc so that a layer of zinc adheres to its surface. It is mainly produced by the continuous galvanizing process, that is, the rolled steel plates are continuously immersed in a plating bath containing molten zinc to make galvanized steel plates;
②Alloyed galvanized steel plate. This kind of steel plate is also made by the hot dip method, but it is heated to about 500°C immediately after coming out of the tank to form an alloy film of zinc and iron. This kind of galvanized sheet has good paint adhesion and weldability;
③Electro-galvanized steel plate. This kind of galvanized steel sheet manufactured by electroplating method has good processability. However, the coating is thin and its corrosion resistance is not as good as that of hot-dip galvanized sheets;
④ Single-sided galvanized steel plate and double-sided galvanized steel plate. Single-sided galvanized steel sheet is a product that is galvanized on only one side. In terms of welding, painting, anti-rust treatment, processing, etc., it has better adaptability than double-sided galvanized sheets. In order to overcome the shortcomings of one side not being coated with zinc, there is another type of galvanized sheet that is coated with a thin layer of zinc on the other side, that is, double-sided galvanized sheet;
⑤Alloy, composite galvanized steel plate. It is made of zinc and other metals such as aluminum, lead, zinc, etc., which are alloyed or even composite-plated steel plates. This kind of steel plate has both excellent anti-rust properties and good painting properties;
In addition to the above five types, there are also colored galvanized steel sheets, printed and painted galvanized steel sheets, PVC laminated galvanized steel sheets, etc. But the most commonly used one is still hot-dip galvanized sheet.