2021-07-28
Galvanized Steel CoilCompared with aluminum zinc alloy, the chemical properties ofis relatively active, so the anti-corrosion ability is quite different. stay
The test under the same outdoor conditions shows that the service life of aluminized zinc plate is more than four times that of
The aluminum zinc alloy structure of aluminumis composed of 55% aluminum, 43.4% zinc and 1.6% silicon cured at 600 ℃. The whole structure is composed of aluminum iron silicon zinc to form a dense quaternary crystal, so as to form a strong and effective barrier to prevent the penetration of corrosion factors.
Characteristics of aluminum zinc plated steel plate:
Corrosion resistance:
The corrosion resistance of "55% aluminum zinc plated steel coil" comes from the barrier protection function of aluminum and the sacrificial protection function of zinc. When zinc makes sacrificial protection in the cutting, scratch and coating scratch parts, aluminum forms an insoluble oxide layer to play the function of barrier protection. The aluminum zinc alloy steel coil has been exposed to various atmospheric environments for more than 20 years. It is confirmed that the edge cutting protection function of 55% aluminum zinc plated steel plate is better than that of galvanized steel plate and 5% aluminum zinc plated steel plate.
Heat resistance:
The heat resistance of 55% aluminum zinc alloy plated steel plate is better than that of galvanized steel plate, which is similar to that of aluminum plated steel plate. Aluminum zinc alloy steel plate can be used in high temperature environment up to 315 degrees.
Reflectance:
55% Al Zn alloy plated steel plate has high reflectivity, making it a heat resistant barrier; The heat reflectance of aluminum zinc plated steel plate is almost twice that of galvanized steel plate. Therefore, it can also achieve energy-saving effect by acting as roof and panel without painting.
Paintability:
Due to the excellent adhesion between the zinc layer and the paint of the aluminized zinc steel plate, when it is used as a sign board for general purposes, it can be painted without pretreatment and weathering treatment; The galvanized steel plate needs weathering treatment and pretreatment.
Application of aluminum zinc plated steel plate:
According to different thickness specifications, the main uses of aluminum zinc plated steel plate are: distribution cabinet (thickness is 1.2-2mm); Solar water heater (0.32mm); Anti theft door panel; Home appliance backplane;
Hot dip galvanizing is generally used for steel strip or steel wire (strand). The steel surface is covered with zinc layer to prevent atmospheric erosion, so as to prevent the continuous corrosion of the substrate and ensure the service life of the substrate. And zinc is more active than iron. In case of corrosion, it can also sacrifice the zinc layer to protect the steel matrix.
Aluminized zinc has stronger protective effect and better corrosion resistance than galvanized products. The whole structure is composed of aluminum iron silicon zinc to form a dense quaternary crystal. This junction crystal forms a barrier on the steel plate, so it can effectively prevent the penetration of corrosion factors. Corrosion resistance comes from the barrier protection function of aluminum and the sacrificial protection function of zinc. When zinc makes sacrificial protection in the cutting, scratch and coating scratch parts, aluminum forms an insoluble oxide layer to play the role of barrier protection.
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