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What is galvanized sheet?

Galvanized sheet refers to a steel sheet coated with a layer of zinc on the surface. Galvanizing is an economical and effective method of corrosion protection that is often adopted. Around half of global zinc production is used in this process.
1. Definition of galvanized steel sheet Galvanized steel sheet is to prevent the surface of the steel sheet from corrosion and prolong its service life. A layer of metal zinc is coated on the surface of the steel sheet.

2. The classification and use of galvanized sheet can be divided into the following categories according to the production and processing methods:

galvanized coil
Hot-dip galvanized sheet. Immerse the thin steel plate in a bath of molten zinc to make a thin steel plate with a layer of zinc adhered to its surface. At present, the continuous galvanizing process is mainly used for production, that is, the coiled steel plates are continuously dipped in a galvanizing tank with dissolved zinc to make galvanized steel plates;

②alloyed galvanized steel plates. This kind of steel panel is also made by hot dip method, but it is heated to about 500℃ immediately after coming out of the tank, so that it can form an alloy film of zinc and iron. This type of galvanized sheet has good paint adhesion and weldability; ③Electro-galvanized steel sheet. This type of galvanized steel sheet manufactured by electroplating has good processability. However, the coating is thinner and its corrosion resistance is not as good as that of hot-dip galvanized panels;

④Single-sided galvanized steel and double-sided galvanized steel. Single-sided galvanized steel sheet, that 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 sheet. In order to overcome the shortcomings of one side not coated with zinc, there is another kind of galvanized sheet coated with a thin layer of zinc on the other side, that is, double-sided differential galvanized sheet;
⑤ alloy, composite galvanized steel. It is an alloy made of zinc and other metals such as lead and zinc or even a composite plated steel plate. This type of steel plate not only has excellent anti-rust performance, but also has good coating performance. In addition to the above five types, there are also colored galvanized steel panels, printed galvanized steel panels, PVC laminated galvanized steel panels, etc. But the most commonly used is still hot-dip galvanized sheet. The invention relates to the surface treatment technology of galvanized sheet, and discloses a method for phosphating the surface of a smooth spangled hot-dip galvanized sheet. deal with.

 


Post time: Jan-03-2023
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