The main function of the zinc layer is to protect the base metal from corrosion. In a humid environment, zinc is more active than iron, so it will undergo oxidation reaction before iron, thus protecting the internal iron from corrosion. The thickness of the zinc layer directly affects the durability of its protective effect. A thicker zinc layer provides longer-lasting protection, extending the life of the product.

The thickness of the zinc layer on galvanized sheets varies according to different application requirements and international standards. Generally, the zinc layer of hot-dip galvanized steel sheets is thicker than that of electro-galvanized steel sheets. The thickness of the zinc layer of hot-dip galvanized sheet is generally between 5-150 microns. According to the quality of the zinc layer, it can be divided into different grades, such as Z100, Z150, Z200, Z275 and Z600. These grades indicate the double-sided galvanizing amount in grams per square meter. The electroplated zinc coating is relatively thin, with a thickness usually between 5 and 30 microns.

The thickness of the zinc layer of alloyed galvanized steel sheet is similar to that of hot-dip galvanizing, but the zinc layer is more tightly bonded to the steel sheet. The thickness of the zinc layer can be measured by the amount of zinc attached (such as the zinc content per square meter). The thicker the layer, the stronger the corrosion resistance is. The selection should be determined in combination with the degree of corrosion in the use environment.

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