The characteristics of aluminum alloy materials are: 1. Low density; the density of aluminum and aluminum alloys is close to 2.7g/, which is about 1/3 of iron or copper. 2. High strength; after a certain degree of cold working, the strength of the matrix can be strengthened, and some grades The aluminum alloy can also be strengthened by heat treatment. 3. Good electrical and thermal conductivity; the electrical and thermal conductivity of aluminum is second only to silver, copper and gold. 4. Good corrosion resistance; the surface of aluminum is easy to naturally produce a dense and firm AL2O3 protective film, which can well protect the substrate from corrosion.