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What is aluminized zinc plate
Aluminum zinc plated steel plate is a registered trademark of BIEC International Inc. and a world patent of BIEC. 31 steel mills in 22 countries in the world have obtained production technology and license from BIEC international company to produce aluminum zinc coated steel plates with 55% of the surface coating of aluminum zinc alloy.
Since the aluminum zinc plating steel plate entered the practical stage in 1972, the global cumulative output has reached 24 million tons, and the annual output is about 3 million tons.
30-35% of the products of aluminized zinc steel plate are used for ceiling, wall and other aspects of the building after color coating. In addition to being a trademark of BIEC, the following products are registered and licensed by BIEC:
The surface of aluminized zinc steel plate is characterized by smooth, flat and gorgeous star flowers, and the basic color is silver white. The special coating structure makes it have excellent corrosion resistance. The normal service life of aluminized zinc plate can reach 25A, with good heat resistance, which can be used in the high temperature environment of 315 ℃; the adhesion between the coating and the paint film is good, with good processing performance, which can be used for stamping, shearing, welding, etc.; the surface conductivity is good.
The coating consists of 55% aluminum, 43.4% zinc and 1.6% silicon by weight. The production process of aluminized zinc steel plate is similar to that of galvanized steel plate and aluminum plate. It is a continuous melting coating process. The corrosion resistance of 55% Al Zn alloy coated steel plate is better than that of the same thickness galvanized steel plate when both sides are exposed to the same environment. The 55% Al Zn alloy coated steel plate not only has good corrosion resistance, but also has excellent adhesion and flexibility.
As the steel plate will be oxidized and rusted when it is damped, the anti-corrosion protection layer must be added on the surface. Generally, the anti-corrosion coating is divided into hot-dip zinc and hot-dip aluminum zinc alloy Al Zn (the composition of aluminum zinc alloy is 55%, zinc 43.5% and silicon 1.5%, referred to as 55% Al Zn). The data shows that the comprehensive anti-corrosion capacity of 55% aluminum zinc plating is 4 times of that of the same thickness zinc plating.
According to foreign experience, the anticorrosive coating of base material of general profiled steel plate (pit plate) shall not be less than 350g / ㎡ (Z35) or 185g / ㎡ (az185) of hot-dip aluminum zinc
The minimum specification of zinc / galvanizing, as cold-rolled section steel and floor slab of building structure, is 275 g / ㎡ (z27), and the requirement of coastal exposed parts is 350 g / ㎡ (Z35).
1. Thermal reflectance:
Aluminized zinc steel plate has a high thermal reflectance, which is twice that of galvanized steel plate. People often use it as heat insulation material.
2. Heat resistance:
Aluminum zinc alloy steel plate has good heat resistance, which can withstand the high temperature of more than 300 degrees Celsius. It is very similar to the high temperature oxidation resistance of aluminum coated steel plate. It is often used in chimney tubes, ovens, illuminators and fluorescent lampshades. Corrosion resistance:
The corrosion resistance of aluminum coated zinc steel coil is mainly due to the protection function of aluminum and aluminum. When zinc is worn, aluminum forms a dense layer of alumina, which prevents further corrosion of the corrosion-resistant material inside.
Because the density of 55% Al Zn is smaller than that of Zn, the area of Al Zn steel plate is more than 3% larger than that of galvanized steel plate under the same weight and thickness of gold plating layer.
4. easy to paint
There is excellent adhesion between the aluminized zinc plate and the paint, which can be painted without pretreatment and weathering treatment.
The coating adhesion of the gold-plated aluminum zinc steel plate is excellent, so it can also be directly applied on the advertising board and general plate without pretreatment such as weathering.
5. The aluminum zinc plated steel plate has a gorgeous silver white surface.
6. Aluminized zinc steel plate and galvanized steel plate have similar processing performance and spraying performance.
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