The difference between galvanized sheet and galvalume plate

The difference between galvanized sheets and aluminum-zinc alloy coated sheets lies in the coating. A layer of zinc material is evenly distributed on the surface of the galvanized sheet, which plays an anode protection role for the base metal. In other words, the zinc material replaces corrosion. , protecting the use of the base material. Here, zinc is like a human shield around important people. After the human shield is sacrificed, it is the core person's turn. The surface coating of galvalume plate is composed of 55% aluminum, 43.5% zinc and a small amount of other elements. At the micro level, the galvanized coating appears as a honeycomb structure, and the "honeycomb" composed of aluminum contains zinc. , in this case, although the galvanized coating also plays the role of anode protection, on the one hand due to the reduction of zinc content, on the other hand because the zinc material is wrapped in aluminum and is not easy to electrolyze, therefore, the role of anode protection is greatly reduced .

Here, galvalume is like body armor worn on important missions. Once a point is breached, the protection at that point is gone. Therefore, once the galvanized sheet is cut, the cut edge will basically lose its protection and will soon rust. Therefore, the galvanized sheet should be cut as little as possible. Once cut, apply anti-rust paint or Only by protecting the edges with zinc-rich paint can the service life of the board be extended. 1. Ordinary pure zinc coating products (GI)

Ordinary hot-dip galvanized products can be divided into ordinary zinc flowers, small zinc flowers, no zinc flowers and smooth surface products according to the surface condition. Because of its advantages such as good corrosion resistance, excellent processing and molding performance, low production cost, and beautiful appearance, it is widely used in construction, automobiles, home appliances and other industries. In particular, small sprinkling and sprinkling-free coating products have fine, dense, smooth surface grains, better paintability and corrosion resistance, and are especially suitable for home appliances, color coating and other industries.

2. Zinc-aluminum alloy coated plate (GF)

Zinc-aluminum alloy coated panels are also called low-aluminum galvanized steel panels. The coating contains 5% Al, 95% Zn, and trace amounts of rare earth elements. The main advantage is that the coating has good plasticity and adhesion, and the corrosion resistance remains unchanged before and after deformation; the atmospheric corrosion resistance is 2 to 3 times that of conventional hot-dip galvanized sheets and it has good coating and weldability. Among all galvanized sheets, its toughness, corrosion resistance and formability are comparable to electro-galvanized sheets. This product is mainly used for corrosion-resistant and weather-resistant environments and coating material substrates.

3. Aluminum-zinc alloy coated sheet (GL)

The coating structure of the aluminum-zinc alloy coated plate is Al-Zn alloy, and the coating composition is 55% Al, 43.3% Zn, and 1.6% Si. Its surface is smooth and has excellent resistance to atmospheric corrosion, which is 2 to 6 times higher than that of the same hot-dip galvanized sheet. It has high temperature corrosion resistance similar to hot-dip aluminum plates, and can be used for a long time without any discoloration or deformation at a high temperature of 315 degrees. The water corrosion resistance is better than hot-dip galvanized sheet and hot-dip aluminum sheet, and the soil corrosion resistance is better than hot-dip galvanized sheet. Its heat reflectivity is higher than 75%, which is twice that of ordinary galvanized sheets. It has good paintability and processability, and is gradually replacing galvanized sheets and is widely used in the world.