The difference between galvanized sheets and aluminized zinc sheets mainly lies in the difference in the coating. A layer of zinc material is evenly distributed on the surface of galvanized sheet, which plays the role of anode protection for the base metal. In other words, the alternative corrosion of zinc material protects the use of base metal. Only when the zinc is completely corroded can the base metal be damaged.
The surface coating of aluminized zinc plate is composed of 55% aluminum, 43.5% zinc, and a small number of other elements. The surface of aluminized zinc coating is a honeycomb structure in microcosmic, and the "honeycomb" composed of aluminum contains zinc. In this case, although the aluminized zinc coating also plays the role of anode protection, on the one hand, due to the reduction of zinc content, on the other hand, because the zinc material is wrapped by aluminum, it is not easy to electrolysis The function of this anode protection is greatly reduced, so once the aluminized zinc plate is cut, it will rust quickly when the cut edge is basically lost. Therefore, the aluminized zinc plate should be cut as little as possible. Once the edge is protected by antirust paint or zinc-rich paint after cutting, the service life of the plate can be extended .