What is magnesium alloy? What are the advantages and disadvantages of this material?
Magnesium alloy is a new lightweight alloy material in the 21st century. Most people know or have heard of this material, but a small number of users do not know what this material is, let alone what its advantages and disadvantages are. Today, Dashuo Magnesium Alloy Company will talk to big guys about it.
What is magnesium alloy?
Magnesium alloy is a high-performance lightweight structural material based on magnesium element and composed of other alloy elements. Its specific gravity is similar to that of plastic, and its stiffness and strength are not inferior to aluminum. It has strong resistance, electromagnetic resistance, thermal conductivity, and conductivity, and can also be fully recovered without pollution.
Advantages of magnesium alloy:
1. Low density, one-third lighter than aluminum, and its specific strength (ratio of tensile strength to density) is higher than aluminum alloy
2. High Fatigue limit
3. Can withstand larger impact loads than aluminum alloy
4. Good thermal conductivity
5. Good castability; Good dimensional stability
6. Easy to recycle
7. Has good machinability
8. Has good shock absorption performance
9. It is superior to engineering plastics in many aspects and can replace engineering plastics; High corrosion resistance in kerosene, gasoline, mineral oil, and alkalis
Disadvantages of magnesium alloy:
10. Flammability
Magnesium has a great affinity with oxygen, and even when it is still in a solid state at high temperatures, it is easy to react with oxygen in the air, releasing a large amount of heat. The generated magnesium oxide has poor thermal conductivity, and the heat cannot be dissipated in a timely manner, which further promotes the oxidation reaction and forms a vicious cycle. Moreover, magnesium oxide is loose and porous, which cannot effectively block the invasion of oxygen in the air.
11. Poor corrosion resistance
Magnesium has high chemical activity and low equilibrium potential. When it contacts with different metals, it is prone to galvanic corrosion and acts as an anode. At room temperature, the surface of magnesium reacts with oxygen in the air to form a magnesium oxide film. However, the dry magnesium oxide film is relatively loose, with a density coefficient of only 0.79, which means that the volume of magnesium oxide generated after magnesium oxidation decreases, resulting in poor corrosion resistance.
In addition, the advantages and disadvantages of magnesium alloys are still under development, and some of them can also be realized as advantages in different environments.
