Galvalume steel sheet is an alloy material, which has aluminum so it has a lot of corrosion resistance, high temperature resistance can withstand high temperatures of more than three hundred degrees, and its density is small, so it can be stamped, cut, welded, etc., and the surface conductivity is very good. it is good. However, there are many sheets in the market, galvanized sheet and galvanized sheet, many people will confuse, so what is the difference between the two? Let's discuss it together:
The main difference between galvanized sheet and galvalume steel sheet is the difference in coating. A layer of zinc material is evenly distributed on the surface of galvanized steel sheet, which acts as an anodic protection for the base material, that is, alternative corrosion protection for zinc materials. In addition to the use of the base material, the base material inside can only be damaged when the zinc is completely corroded.
The surface coating of aluminized zinc sheet is composed of 55% aluminum, 43.5% zinc and a small amount of other elements. The surface of the aluminized zinc coating is a honeycomb structure under the microscopic view. The "honeycomb" made of aluminum contains zinc. In this case, although the aluminum-zinc coating also plays the role of anode protection, on the one hand, due to the reduction of zinc content, on the other hand, the zinc material is wrapped in aluminum and is not easy to electrolyze, so the role of anode protection is greatly reduced. Therefore, once aluminum is plated The zinc plate is cut, and it will rust soon when the cut edge is basically lost and protected. Therefore, the aluminum-zinc plate should be cut as little as possible. Once cut, the edge can be protected with anti-rust paint or zinc-rich paint. The service life of the plate is extended.
The surface of galvalume steel sheet is more beautiful than galvanized sheet. At the same time, the price of galvanized sheet is more expensive than galvanized sheet, and the price of small spangle is more expensive than that of large spangle.
In cities where the air is humid and rainy, once a certain point of the galvanized steel sheet is rusted, if you do not take measures in time, the rusty place will gradually grow larger and eventually even the entire board; while the galvanized sheet will rust even if a certain point appears Will not spread.
The surface of the galvanized steel sheet presents a unique smooth, flat and gorgeous star flower, and the base color is silver white. The special coating structure makes it have excellent corrosion resistance. The normal service life of the aluminum-zinc plate can reach 25a, and it has good heat resistance and can be used in a high temperature environment of 315°C; the adhesion of the coating and the paint film is good, and it has good processing properties, and can be stamped, cut, welded, etc. The surface conductivity is very good.
The coating composition is composed of 55% aluminum, 43.4% zinc and 1.6% silicon in weight ratio. The production process of galvanized steel sheet is similar to that of galvanized steel sheet and aluminized sheet, which is a continuous molten coating process. The 55% aluminum-zinc alloy-coated galvanized steel sheet has better corrosion resistance than the galvanized steel sheet of the same thickness when exposed to the same environment on both sides. The 55% aluminum-zinc alloy coated aluminum-zinc steel plate not only has good corrosion resistance, but also the color-coated products have excellent adhesion and flexibility.
The galvanized steel sheet has a high heat reflectivity, which is twice that of the galvanized steel sheet. We can use it as a thermal insulation material. Galvalume also has good heat resistance, can withstand high temperatures of more than 300 degrees Celsius, and the high temperature oxidation resistance of aluminized steel is very similar, often used in chimney halls, ovens, luminaires and fluorescent lampshades. Because the density of 55% AL-Zn is lower than that of Zn, the area of the galvalume steel sheet is more than 3% larger than that of the galvanized steel sheet with the same weight and the same thickness of the gold coating.
What are the advantages of galvanized steel sheet and galvanized steel sheet?
