For how long does a magnet keep its magnetic properties? It depends on its application and on the ambient that surrounds it.
If a permanent magnet is not damaged, kept at room temperature and in a dry environment, far from radiations and external magnetic fields, it will technically keep its magnetic properties for a long time we cannot define. In these conditions, it is very rare that magnets’ performances would be unsatisfying: Neodymium Iron Boron and Samarium Cobalt close to 0%, Ferrite under 2% and Alnico under 3%.
If conditions are not suitable, magnets’ long-term performances will be less satisfying. In critical situations, for example for military and aerospace application, it is better to use Samarium Cobalt magnets.
How long does it take for neodymium magnets to show corrosion? This also depends on the application and the environment. If the coating is damaged, corrosion can show itself more quickly. It is important to choose the right coating since it would help to reduce this risk. Samarium Cobalt, Ferrite and Alnico magnets do not have this kind of problem, contrary to Neodymium and Iron Boron ones.
What happens to magnets when temperature gets high? It depends on material. Generally, within certain temperature limits, there will be reversible magnetic losses. These limits changes with material we are dealing with. Samarium Cobalt, Alnico and Ferrite have strong resistance in high temperature and can be applied in situations in which thermal element is highly present.
So, it is possible to find a magnet that will keep its magnetic properties forever, but it always depends on its application and on the conditions in which it is used. The application, the ambient, the material and the magnet’s design will obviously affect its durability.
For more information contact our team of experts.
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