The types of metal coatings used in our daily processing are: pure zinc (+Z), aluminum-zinc (+AZ), zinc-aluminum-magnesium (+AZM/AM), and different hot-dip coated steel parts have different characteristics :

1. Pure zinc coating

The zinc content of the bath in the hot-dip galvanizing pot is not less than 99%, which is the most economical type of anti-corrosion coating at present.

Pure zinc-coated steel sheets are divided into two types: without spangle and with spangle, and their corrosion resistance is almost the same. If you need to spray or paint later, the products without zinc flowers will be more beautiful; while the thick zinc layer products usually have flowers (for example, the weight of the zinc layer is 275g/m2 on both sides).

2. Aluminum zinc coating

The plating solution contains about 55% aluminum, about 1.6% silicon, and the remaining component is zinc. The corrosion resistance of the aluminum-zinc coating is higher than that of the pure zinc coating in most environments. Excellent steel mills can produce uniform and beautiful spangles for direct bare use of home appliances, but aluminum-zinc coatings also have some disadvantages.

The welding performance of Al-Zn coated steel plate is not as good as that of pure zinc, especially when using resistance welding, the molten coating metal will stick to the electrode tip. Because the hardness of the metal bonded after melting is relatively high, the removal efficiency of ordinary grinding tools is very low, which will lead to the scrapping of the electrode tip, so the welding process should be minimized in use.

In addition, the protection of the aluminum-zinc coating to the cut-off of the steel plate is far less than that of the pure zinc coating (and far less than the zinc-aluminum-magnesium coating).

3. Zinc-aluminum-magnesium coating

The zinc-aluminum-magnesium-coated steel plate was originally developed to replace some of the use scenarios of stainless steel. Although stainless steel has good corrosion resistance, the cost is too high; and other galvanized steel plates are not as good as stainless steel in surface corrosion resistance, but more importantly, for The protection of the fractured section or coating is poor.

The zinc-aluminum-magnesium coating has excellent red rust resistance and self-healing corrosion resistance of the shear section (the initial corrosion product of the zinc-aluminum-magnesium coating will flow and cover the exposed substrate), and it also has far superior to aluminum plating. Weldability of zinc-coated steel sheets.

Zinc-aluminum-magnesium-coated steel parts perfectly solve the shortcomings of ordinary coated steel parts that cannot effectively protect shear fractures, missing plating points, and coating damage. It can be said that it is one of the coated steel parts closest to stainless steel in terms of comprehensive performance. The corrosion-resistant self-healing effect of the cut section is a major feature of the product.

The products are mainly used in civil construction (keel ceiling, perforated board, cable bridge, seismic support), agricultural and livestock production (agricultural feeding greenhouse steel structure, steel structure accessories, greenhouse, feeding equipment), railway road, power communication (high power transmission and distribution Low-voltage switchgear, box-type substation outer body), automotive motors, industrial refrigeration (cooling towers, large outdoor industrial air conditioners) and other industries, the application fields are very wide.