When both sides are exposed to the same environment, the aluminum zinc plated steel plate with 55% aluminum zinc alloy coating has better corrosion resistance than the galvanized steel plate with the same thickness. The aluminum zinc plated steel plate with 55% aluminum zinc alloy coating not only has good corrosion resistance, but also the color coated products have excellent adhesion and flexibility.
The difference between galvanized sheet and aluminized zinc sheet mainly lies in the difference of 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 all zinc is corroded can it damage the base metal inside.
The surface coating of aluminized zinc plate is composed of 55% aluminum, 43.5% zinc and a small amount of other elements. Under the micro level, the surface of aluminized zinc coating is honeycomb structure, and the "honeycomb" composed of aluminum contains zinc. In this case, although 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, due to the fact that zinc material is wrapped by aluminum and not easy to be electrolyzed, the role of anode protection is greatly reduced, Therefore, once the aluminized zinc plate is cut, it will soon rust when the cut edge is basically lost and protected. Therefore, the aluminized zinc plate should be cut as little as possible. Once the edge is protected with antirust paint or zinc rich paint after cutting, the service life of the plate can be prolonged.
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