Aluminum Zinc Coated Coil

Aluminum Zinc Coated Coil

Aluminum Zinc Coated Coil

Aluminum Zinc Coated Coil

Due to the oxidation and corrosion caused by moisture on steel plates, it is necessary to add a corrosion-resistant protective layer on the surface. The commonly used anti-corrosion coatings are hot-dip galvanized Zn and hot-dip aluminum zinc alloy Al Zn (aluminum zinc alloy composition is 55% aluminum, 43.5% zinc, and 1.5% silicon, abbreviated as 55% Al Zn). According to the data, the comprehensive anti-corrosion ability of 55% aluminum zinc plating is four times that of galvanizing with the same thickness.
According to foreign experience standards, the anti-corrosion coating of the base material of general profiled steel plates (pit plates) should not be less than hot-dip galvanized 350g/㎡ (Z35) or hot-dip aluminum zinc plated 185g/㎡ (AZ185)
As the minimum hot-dip galvanized layer for cold-rolled steel and floor slabs in building structures, the Zinc/Galvanizing specification is 275 g/㎡ (Z27), and the requirement for exposed coastal components is 350 g/㎡ (Z35).

Aluminum zinc coated steel plate has many excellent characteristics: strong corrosion resistance, which is three times that of pure galvanized steel plate; There are beautiful zinc flowers on the surface, which can be used as exterior panels for buildings.
Corrosion resistance:
The corrosion resistance of "aluminum zinc coated steel coils" is mainly due to the protective function of aluminum. When zinc is worn, aluminum forms a dense layer of alumina, preventing further corrosion of the interior by corrosion-resistant substances.
Heat resistance:
Aluminum zinc alloy steel plate has good heat resistance and can withstand temperatures of over 300 degrees Celsius, similar to the high-temperature oxidation resistance of aluminum plated steel plate. It is often used in
Chimney pipes, ovens, lighting fixtures, and fluorescent lampshades.
Heat reflectivity:
The thermal reflectivity of aluminum zinc coated steel plate is very high, twice that of galvanized steel plate, and people often use it as a thermal insulation material.
Economy:
Because the density of 55% AL Zn is lower than that of Zn, the area of aluminum zinc coated steel plate is more than 3% larger than that of coated steel plate with the same weight and thickness of gold plating layer.

The main difference between galvanized sheet and aluminum zinc coated sheet lies in the coating. A layer of zinc material is evenly distributed on the surface of galvanized sheet, which plays an anodic protection role for the base material. In other words, the substitutional corrosion of zinc material protects the use of the base material, and only when all zinc is corroded can it damage the base material inside.
The surface coating of aluminum zinc coated sheet is composed of 55% aluminum, 43.5% zinc, and a small amount of other elements. At the micro level, the surface of the aluminum zinc coating is a honeycomb structure, and the "honeycomb" composed of aluminum contains zinc. In this case, although the aluminum zinc coating also plays an anodic protection role, on the one hand, due to the reduction of zinc content, and on the other hand, because the zinc material is wrapped in aluminum and is not easy to electrolyze, the anodic protection effect is greatly reduced. Therefore, once the aluminum zinc coated sheet is cut, it will quickly rust when the cut edge is basically lost and protected. Therefore, aluminum zinc coated sheet should be cut as little as possible. Once cut, anti rust paint or zinc rich paint should be applied to protect the edge to extend the service life of the sheet.

Application of aluminum zinc plated sheet