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The difference between galvanized and Galvalume steel coil (GL)

Release time：

2022-07-02 00:00

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The difference between galvanizing and Galvalume steel coil (GL) mainly lies in the difference of coating. The surface of galvanized steel coil is evenly distributed with a layer of zinc material, which plays an anodic protection role for the base metal, that is to say, the replacement of zinc material Corrosion protects the use of the base metal, and only when all the zinc is corroded can the base metal inside be damaged.

The surface coating of Galvalume steel coil (GL) is composed of 55% aluminum, 43.5% zinc and a small amount of other elements. The surface of the aluminum-zinc coating is a honeycomb structure at the microscopic level, and the "honeycomb" composed of aluminum contains Zinc, in this case, although the aluminum-zinc coating also plays the role of anodic protection, on the one hand, due to the reduction of zinc content, on the other hand, because the zinc material is wrapped by aluminum and is not easy to be electrolyzed, the role of anodic protection is greatly reduced. If the galvanized sheet is cut, it will rust quickly when the cut edge is basically lost to be protected. Therefore, the galvanized sheet should be cut as little as possible. Once cut, apply anti-rust paint or zinc-rich paint to protect the edge before It can prolong the service life of the board.

The surface of Galvalume steel coil (GL) has a characteristic smooth, flat and gorgeous star flower, and the base color is silvery white. The special coating structure makes it have excellent corrosion resistance. The normal service life can reach 25a, the heat resistance is very good, and it can be used in high temperature environment; the adhesion between the coating and the paint film is good, and it has good processing performance. It can be punched, sheared, welded, etc., and the surface conductivity is very good.

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