1. The extraction and production of raw materials severely pollute the environment, and the use of magnesium alloy is limited by environmental protection;

2, magnesium alloy with cover agent flame retardant, easy to produce harmful body "dust", workers respiratory protection, need to invest;

3, magnesium alloy cover agent flame retardant, easy to produce HCL gas, combined with water vapor, produce highly corrosive dilute hydrochloric acid, to the factory staff, equipment and plant infrastructure damage, workshop roof crane support need to prevent erosion;

4, magnesium alloy with SF6 mixed gas flame retardant, SF6 gas because of manufacturing mixed with toxic impurities, such as HF, so the need for strict management; SF6 is a greenhouse gas, its use in China will be limited;

5, magnesium alloy easy combustion, melting, heat preservation, transportation to prevent combustion, technical threshold;

6, magnesium alloy combustion easily, melting furnace, holding furnace alloy residue cleaning workload is large;

7. Magnesium alloy burns easily. If the equipment is old, the leakage outside the machine is frequent, the alloy insulation furnace is not sealed, the hydraulic oil should be used without fuel to prevent fire, and the flammable and explosive gases and liquids on the production site should not be stored;

8. Magnesium alloy burns easily, and the machine and melting furnace need to put (a big cylinder) yellow sand placed flammable magnesium slag, (a big barrel) flame retardant cover agent, as the fire produced by scattered escape material in the process of extinguishing die casting;

9, magnesium alloy dust will spontaneous combustion, high temperature magnesium slag will also burn, need to focus on special treatment;

10, magnesium alloy as a structural material, easy to be affected with moisture oxidation, need to do surface treatment, chromium plating and anodic oxidation pollution of the environment magnesium alloy as a structural material, bolt connection due to electrochemical erosion and creep, resulting in loose fasteners;

11, magnesium alloy castings low thermal strength, easy to produce hot crack, resulting in castings leakage and fracture;

12, magnesium alloy specific heat capacity is low, heat loss is fast, need mold generally need to design heating device;

The magnesium alloy will burn when it meets oil and explode when it meets water; Large magnesium alloys burn out of control, and the fire is difficult to control.