The main difference between galvanized steel sheet and aluminum-zinc plated steel sheet lies in their coatings. The surface of galvanized steel sheet is evenly coated with zinc, which plays the role of anodic protection for the base material. In other words, the substitution corrosion of zinc material protects the use of the base material. Only when all the zinc is corroded can the inside base material be damaged.
The surface coating of aluminum-zinc plated steel sheet is composed of 55% aluminum, 43.5% zinc, and a small amount of other elements. Under a microscope, the aluminum-zinc coating surface appears as a honeycomb structure, with zinc enclosed in the "honeycombs" formed by aluminum. In this case, although the aluminum-zinc coating also plays the role of anodic protection, on the one hand, due to the reduction of zinc content and on the other hand, due to the fact that zinc material is wrapped by aluminum and not easy to be electrolyzed, the effect of anodic protection is greatly reduced. Therefore, once the aluminum-zinc plated steel sheet is cut, the edges that are basically unprotected under the cutting will soon rust. Therefore, aluminum-zinc plated steel sheets should be cut as little as possible. Once cut, the edges should be protected with anti-rust paint or zinc-rich paint to extend the service life of the sheet.
The surface of aluminum-zinc plated steel sheet is more beautiful than that of galvanized steel sheet. Meanwhile, the price of aluminum-zinc plated steel sheet is more expensive than that of galvanized steel sheet, and the price of small zinc flower is more expensive than that of large zinc flower.
