Will the magnetism of Neodymium Arc Magnet weaken after long-term use?

After long-term use, the magnetism of Neodymium Arc Magnet will indeed weaken. This phenomenon of weakened magnetic force can be attributed to the combined effect of multiple factors. The magnetic force of NdFeB magnets comes from the micro-regions and magnetic domains in their lattices. During the magnetization process, non-magnetic metals in the micro-regions of the lattice will be attracted by the magnetic field. When the magnetic field disappears, these micro-regions will return to their initial state on their own. This process is hysteresis. Magnetic hysteresis will cause the loss of energy inside the magnet, resulting in the attenuation of magnetic force. In addition, residual magnetic loss is also one of the reasons for the weakening of magnetic force, that is, after magnetization, the magnet will retain part of its magnetism even if the external magnetic field is removed, but this part of the residual magnetism will gradually decrease over time.
In high temperature environments, the physical properties of NdFeB magnets will change. As the temperature rises, the lattice vibration inside the magnet intensifies. This dynamic change at the microscopic scale destroys the orderly arrangement and interaction between magnetic domains (i.e., the tiny magnetic regions inside). Magnetic domains are the basis of magnetism, and their stable arrangement is the key to maintaining strong magnetic force. Therefore, when the interaction between magnetic domains weakens, the overall magnetization of the magnet decreases, resulting in a weakened magnetic force. If the temperature continues to rise above the maximum operating temperature of the magnet, this weakening of magnetism may be permanent, that is, the magnet cannot recover to its original magnetic properties after cooling.
Humidity and corrosion are two other important factors that threaten the performance of NdFeB magnets. High humidity environments may accelerate chemical reactions on the surface of the magnet, especially when the coating is damaged. The coating is designed to protect the magnet from the external environment, including water, oxygen and other corrosive substances. Once the coating is damaged, water molecules and other corrosive media can penetrate into the interior of the magnet, triggering oxidation, rust and other processes. These processes not only affect the appearance of the magnet, but more importantly, reduce its magnetic properties, because oxidation products and rust interfere with the normal operation of the magnetic domains.
In modern industrial environments, alternating magnetic fields generated by various electrical and electronic equipment are ubiquitous. These alternating magnetic fields interact with the static magnetic fields of NdFeB magnets, resulting in complex electromagnetic phenomena such as magnetic shielding, magnetic saturation and magnetic reversal. These phenomena may weaken the magnetic force of the magnet, especially in strong alternating magnetic fields or complex magnetic field environments. Long-term exposure to such an environment may gradually reduce the magnetic properties of the magnet until it cannot meet the application requirements.
In equipment such as motors, NdFeB magnets are often used as one of the key components to participate in high-speed rotation or frequent vibration. This mechanical stress may cause slight changes in the internal structure of the magnet, such as lattice distortion, crack expansion, etc. Over time, these slight changes will accumulate and affect the overall performance and stability of the magnet. In addition, if the gap between the magnet and the surrounding parts is improper or the lubrication is insufficient, direct wear may also occur, resulting in a reduction in the size or shape of the magnet body, thereby reducing its magnetic properties.
In order to slow down the rate of magnetic force attenuation of Neodymium Arc Magnet, the magnetic properties and stability of the magnets can be improved by optimizing the material composition and preparation process during the manufacturing process of the magnets. The magnets are surface treated, such as coating protection, to increase their corrosion resistance and wear resistance. When using magnets, be careful to avoid exposing them to high temperature, high humidity and strong magnetic field environments, and reduce mechanical vibration and wear.