How To Store Large Strong Neodymium Magnets Safely

Update:28-12-2020
Summary:

Accidents often occur, especially when removing and sto […]

Accidents often occur, especially when removing and storing large Strong Neodymium Magnets. In many cases, plastic partitions are used to store magnets, but even so, the magnets will still fly and stick to each other, usually carrying some skin.

To manage, pack and store strong neodymium magnets, appropriate methods must be used, especially certain safety aspects must be considered.
In fact, some receiving or storage departments in some factories are not familiar with the strength of strong neodymium magnets, which may cause personal injury or damage to parts. All persons who may come into contact with the alloy should be aware of the dangers of handling these magnets. If the magnets are allowed to collide with each other or on a solid surface, the brittleness of the alloy will cause flying debris.In this sense, if necessary precautions are not taken, storing large and strong neodymium magnets will become a great danger.

What are the methods for storing large strong neodymium magnets safely?

The main method of storing large strong neodymium magnets is to use wooden boxes. In many cases, these products must be transported or simply packaged for safe storage, but this protection must be provided because the field density emitted from the side of the package exceeds the specified value and is therefore considered a dangerous product (due to its size).
To manage, pack and store large and strong neodymium magnets, proper methods must be used and certain safety aspects must be considered.
Therefore, when storing large-scale strong neodymium magnets and using and cleaning magnets, they must be mainly protected from three types of factors, which are conducive to demagnetization and even destruction. These aspects are:

Mechanical protection. Do not knock them, so it is convenient to connect them "closed magnetic circuit" to the iron sheet and put them in a box with a padded inner surface. Even if the blowing strength is not strong enough to break it, they are very effective in reducing the magnetization of the magnet. This is most obvious when the magnet is at a higher temperature (for example, in industries where steam nozzles are used to clean certain magnets).

Chemical protection. The magnet must not be in contact with corrosive or humid environments. Therefore, it is convenient to place them in a sealed box with desiccant (such as silica gel) particles. Rare earth permanent magnets such as sa and neodymium magnets (such as SmCo5, Sm2Co17 or Nd2Fe14B) are easily oxidized only when they are in contact with oxygen in the air. Therefore, usually, its surface is metalized with nickel.

Thermal Protection. The magnet should be stored and used at the lowest possible temperature, as this will accelerate its demagnetization. Therefore, for a given application, a magnet should be selected with a material whose critical temperature Tc is approximately 3 times the operating temperature. For example, from a temperature perspective, the magnet with the best magnetism is the worst. In fact, Nd2Fe14B has a Tc = 310 degrees Celsius, so it is not recommended to place it at a temperature much higher than 100 degrees Celsius.

On the other hand, special attention must be paid to metal frames with small spacing, because they will cause the magnet to jump or move when entering. Therefore, the recommended safe distance between the device and the magnet should be maintained, and large magnets should not be stored near devices with cathode ray tubes (CRT) or magnetic storage media. Due to the demagnetization effect, magnets of different alloys may need to buffer each other.

In short, to prevent accumulation of waste, magnets should be stored in closed clean containers. The magnet must remain in a state of adsorption, and all gaskets are intact.
Why is that? I do not know. Because this will attract iron particles from the air and surrounding surfaces. These particles will accumulate and look like small "hairs" on the surface of the magnet or package.
In this production line, in addition to using protectors or wooden boxes, large magnets should also be stored in an environment with low humidity and moderate temperature.

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