Application of cast aluminum magnesium (Al-Mg) alloy

The mass fraction of Mg in Al-Mg alloy is 4%~11%. The alloy has low density, high mechanical properties, excellent corrosion resistance, good machining performance, and bright and beautiful machining surface. However, due to the complex smelting and casting process, these alloys are not only used as corrosion resistant alloys, but also used as decorative alloys. The characteristics and application of common cast Al-Mg alloy are as follows.

1, ZL301 alloy ZL301 alloy has high strength, good elongation, excellent cutting performance, good weldability, can anodize, shake, the disadvantage is that there is a tendency of microscopic loose, difficult casting. ZL301 alloy is used to manufacture high load, working temperature below 150 degrees Celsius, and work in the atmosphere and seawater of high corrosion resistance parts, such as frame, support, rod and accessories.

2, ZL303 alloy ZL303 alloy good corrosion resistance, good weldability, good cutting performance, easy polishing, casting performance is acceptable, mechanical properties are low, can not be heat treatment strengthening, has the tendency to form shrinkage cavity, widely used in die casting. This kind of alloy is mainly used for medium load parts under corrosion or parts in cold atmosphere and operating temperature not more than 200 degrees Celsius, such as Marine parts and machine shells.

3, ZL305 alloy ZL305 alloy is mainly on the basis of Al-Mg alloy added Zn, control the natural aging, improve the strength and stress corrosion resistance, has good comprehensive mechanical properties, reduce the alloy oxidation, porosity and porosity defects. This kind of alloy is mainly used for bearing high load, working temperature below 100 degrees Celsius, and in the atmosphere or seawater work requirements of high corrosion parts, such as Marine ship parts.