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Prospects for the future development of magnesium alloy products industry

With the development of magnesium smelting and processing technology and the decline in production costs, China's magnesium industry will be ready to go. China's magnesium alloy industry is in the stage of rapid development. As an excellent material for weight reduction, energy saving and environmental protection, magnesium will play an important role in the future sustainable development of the world.

Expanding the application of magnesium will not only be the world trend, but also an opportunity for China. For example, the cast magnesium alloy sacrificial anode used for underground metal pipeline protection is characterized by small density, negative potential, and large difference in protection potential between steel and steel. The protection radius is large, the unit weight is large, and the protected metal is easy to be polarized. It is especially suitable for the protection of high resistivity soil and fresh water metal.

Therefore, when the magnesium alloy sacrificial anode is connected to the underground protected metal by a cable or the like, the magnesium alloy sacrificial anode and the protected metal form a large battery in the soil medium, and the protected metal body is The cathode, because the potential of the magnesium alloy sacrificial anode is lower than the potential of the protected metal body, is an anode in the protection battery, and is consumed by corrosion, so it is called a "sacrificial" anode. It can be seen that the magnesium alloy sacrificial anode has a life cycle. As the service life is extended, the magnesium in the sacrificial anode of the magnesium alloy continuously loses electrons and forms magnesium ions and is consumed. This process is very safe.

At the same time, the product of the magnesium alloy sacrificial anode is non-toxic, and the magnesium alloy sacrificial anode used in the soil or in the household electric water heater does not cause damage to the soil and the human body. It has been reported in the literature that magnesium alloy sacrificial anodes are used in electric water heaters and are also beneficial to human health. In order to reduce the corrosion rate of the magnesium alloy sacrificial anode, it is sometimes necessary to provide a protection current from an external power source, and the external power source introduces the protection current into the ground through the buried auxiliary anode, and supplies the protected metal through the soil, and the protected metal remains in the large battery. In the cathode, only the reduction reaction occurs on the surface, and the oxidation reaction of the metal ions does not occur again, thereby suppressing the corrosion.

Magnesium is an excellent thermal conductor, and as a physical object, the entire part must be heated to near the melting point temperature before it is ignited. Usually this does not happen unless the solid magnesium is surrounded by a fire from another source. In this respect, magnesium alloy sacrificial anodes do not require special packaging and protection, and are very convenient for storage and transportation.

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