Galvanized steel sheet is a new type of construction material, which is electroplated with a layer of metallic zinc on the surface, which mainly plays a role of anti-corrosion. The surface is electroplated with a layer of zinc metal of about 1 mm, which has the effect of anti-corrosion, and is widely used in the construction industry. This kind of zinc-coated thin steel plate is called galvanized sheet. Galvanizing is an economical and effective anti-corrosion method that is often used. About half of the world's zinc production is used in this process.
In theory, zinc is a heavy metal for the human body, but there are also many commonly used galvanized materials. The key is that zinc will be oxidized in the air for a period of time. This oxide should not be harmful.
Galvanized steel sheets can be divided into the following categories according to production and processing methods:
① Hot dip galvanized steel sheet. The thin steel plate is immersed in the molten zinc tank, so that a thin steel plate with a layer of zinc is adhered to the surface. At present, it is mainly produced by continuous galvanizing process, that is, continuous immersion of rolled steel sheets in a galvanized bath with molten zinc to make galvanized steel sheets;
②Alloyed galvanized steel sheet. This kind of steel sheet is also manufactured by hot dipping method, but after exiting the tank, it is heated to about 500°C to form an alloy film of zinc and iron. This kind of galvanized sheet has good paint adhesion and weldability;
③Electro-galvanized steel sheet. The galvanized steel sheet produced by the electroplating method has good workability. But the coating is thinner, and the corrosion resistance is not as good as the hot-dip galvanized sheet;
④Single-sided and double-sided differential galvanized steel sheet. Single-sided galvanized steel sheet is a product that is galvanized on one side only. In welding, painting, anti-rust treatment, processing, etc., it has better adaptability than double-sided galvanized sheet. In order to overcome the shortcomings of uncoated zinc on one side, there is another galvanized sheet coated with a thin layer of zinc on the other side, that is, double-sided differential galvanized sheet;
⑤Alloy and composite galvanized steel sheet. It is a steel plate made of zinc and other metals such as lead and zinc alloys and even composite plating. This kind of steel plate not only has excellent anti-rust performance, but also has good coating performance.
