16. pre-galvanized trough cable tray
Galvanized sheet refers to the steel sheet with a layer of zinc on the surface. Galvanizing is an economical and effective anti-corrosion method often used. About half of the world's zinc production is used in this process.
According to production and processing methods, it can be divided into the following categories:
① Hot dip galvanized steel plate. Immerse the steel sheet in the molten zinc bath
② Alloyed 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 groove to form an alloy film of zinc and iron. This kind of galvanized sheet has good coating adhesion and weldability;
③ Electro galvanized steel sheet. This kind of galvanized steel sheet made by electroplating has good processability. However, the coating is thin and the corrosion resistance is not as good as that of hot-dip galvanized sheet;
④ Galvanized steel sheet with single side plating and double side difference. Single side galvanized steel plate, that is, products galvanized on one side only. It has better adaptability than double-sided galvanized sheet in welding, coating, antirust treatment, processing, etc.
In order to overcome the disadvantage of not coating zinc on one side, there is another kind of galvanized sheet coated with thin layer of zinc on the other side, that is, double-sided poor galvanized sheet;
⑤ Alloy, composite galvanized steel sheet. It is an alloy made of zinc and other metals such as aluminum, lead, zinc and even a composite plated steel plate. This kind of steel plate not only has excellent rust prevention performance, but also has good coating performance;
In addition to the above five types, there are also colored galvanized steel plates, printing coated galvanized steel plates, PVC laminated galvanized steel plates, etc. But at present, the most commonly used is still hot-dip galvanized sheet.
