Why are magnesium alloy wheels not often seen on the market?

Release time:

2023-06-08 16:34

For a car, the wheel hub can be said to be an indispensable accessory in a car. As we all know, the wheels that everyone uses are all aluminum alloy wheels. Some people will be more curious. Not using magnesium alloy wheels? Magnesium alloy material is not much lighter than aluminum alloy material? Why don't you often see this kind of hub on the market?

Why are magnesium alloy wheels not often seen on the market? The reason for
is corrosion resistance. Strength, fatigue performance, cost are not the main. Aluminum alloy wheels are light enough, you want lighter? Carbon fiber wheels! In the foreseeable time, the application of magnesium alloys in automobiles will not have much development, except for hydrogen storage fuel cells.

magnesium alloy is a metal material that has received widespread attention in the field of automotive electronic products in recent years. Its light weight (specific gravity 1.74g/cm3, lighter than the weight of aluminum 1/3) is conducive to the weight reduction of automobiles and has good mechanical properties. It can achieve the purpose of energy saving and fuel saving. However, magnesium is afraid of acid, salt and water. If surface treatment is not done, as long as 5% salt water can corrode magnesium products beyond recognition in one hour, and even can be perforated. Even if surface treatment is done, if the surface is damaged, the service life of the product will be reduced, and the corrosion resistance is relatively poor. On the other hand, in terms of price and cost, magnesium alloy is very expensive and has not been popularized in China. At present, there are only a few wheels with magnesium alloy for super-running.

Not only the wheel hub, but also the number of magnesium alloys used in other parts of the car is decreasing year by year. More than ten years ago, the United States planned to use an average of 140kg per vehicle in automobiles, but the use of magnesium alloy components has been declining for so many years. At present, it is only 1kg per vehicle. Volkswagen uses more magnesium alloys, but it is also limited. At present, magnesium alloys are not allowed to be used in civil aviation in the United States. The flame retardant magnesium handed in wants to be used in airplanes. The progress is not smooth and it is not dare to be used in China. The main reason is that the development of magnesium alloy is slow, many expected goals have not been achieved, and the cost is also an important factor. The price of magnesium is not much different from that of aluminum, but the processing cost, the requirements of processing conditions, surface treatment and so on, make magnesium alloy parts far more than aluminum alloy.

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