The aluminum-silicon casting aluminum alloy is characterized by good casting performance, high corrosion performance, low density and good mechanical properties. The main disadvantage is that the formation of an oxide film and a tendency to inhale are large, and it is easy to cause waste in the casting, and is suitable for manufacturing a structural member having a complicated structure and withstanding a certain load, impact resistance and corrosion resistance.
The aluminum-copper-cast aluminum alloy is characterized by better thermal strength than other cast aluminum alloys, lighter in weight, and less tendency to form an oxidized film. The main disadvantages are poor casting process performance, high density, poor corrosion resistance, and corrosion. Poor, suitable for the manufacture of high-strength parts that work under the conditions of Gong Aiwen, or alloys with a simple shape and magnesium content of 7%-8%. The corrosion resistance is similar to that of pure aluminum, and the mechanical properties at room temperature are high. The density is small, and the addition of zinc, manganese, and the like to the aluminum-magnesium alloy can improve its performance, and is suitable for manufacturing parts with high corrosion resistance and large load.
The characteristics of aluminum-zinc cast aluminum alloy have the tendency of “self-hardening”, that is, the natural aging ability is strong, the strength is high, the casting process is simple, and the main disadvantage is that the corrosion resistance is poor, the casting is hot and the density is large.