5052 is a kind of Al Mg alloy, which is widely used, especially in the construction industry. It is the most promising alloy. It has good corrosion resistance, weldability, cold workability and medium strength. The main alloy element of 5052 is magnesium, which has good forming and processing performance, corrosion resistance, weldability and medium strength. It is used to manufacture aircraft oil tank, oil pipe, sheet metal parts of traffic vehicles and ships, instruments, street lamp bracket and rivets, hardware products, electric appliance shell, etc. ② Al-Mn series alloy is the most widely used antirust aluminum, which has high strength, especially fatigue strength: high plasticity and corrosion resistance, can not be strengthened by heat treatment, good plasticity in semi cold work hardening, low plasticity in cold work hardening, good corrosion resistance, good weldability, poor machinability and polishing. It is mainly used for low load parts that require high plasticity and good weldability and work in liquid or gas medium, such as oil tank, gasoline or lubricating oil conduit, various liquid containers and other small load parts made by deep drawing: wire rod is used for rivets.