Is this Disc Magnet With Hole suitable for outdoor environments? How is its weather resistance?

The outdoor applicability of Disc Magnet With Holes depends first on their core materials. If rare earth permanent magnet materials such as NdFeB are used, although they have the advantages of high remanence and strong magnetic energy product, their material properties have obvious shortcomings: NdFeB is hard and brittle, has weak impact resistance, and is prone to oxidation reactions in humid environments, causing the magnetism to gradually decay over time. This decay is particularly significant when exposed to high humidity or drastic temperature differences outdoors for a long time. Therefore, NdFeB magnets that have not been specially protected are difficult to meet the needs of long-term outdoor use, and their applicable scenarios need to be carefully evaluated.

The surface treatment process is a key factor in determining the weather resistance of magnets. The nickel plating process can effectively isolate water vapor, oxygen and corrosive media by forming a dense nickel oxide film on the surface of the magnet, and is suitable for moderately corrosive environments; the zinc plating process uses the sacrificial anode protection characteristics of zinc to delay substrate corrosion, but its protective life is significantly affected by the thickness of the zinc layer and the corrosiveness of the environment. It should be noted that even after the coating treatment, if the magnet is in acid rain, salt spray or high humidity environment for a long time, the protection may still fail due to coating damage or penetration of corrosive media. Therefore, it is recommended to select a suitable surface treatment solution based on the specific use environment and regularly check the integrity of the coating.

The Curie temperature of NdFeB magnets is usually lower than 200℃. When the ambient temperature exceeds its maximum operating temperature, the magnetism will be irreversibly lost. It is necessary to improve the temperature resistance by adding heavy rare earth elements such as dysprosium and terbium or optimizing the magnet structure; humid air or coastal salt spray environment will accelerate the corrosion of metal coatings. It is recommended to use multi-layer composite coatings or organic coatings to enhance the protection ability; collision, friction or foreign body scratches may occur during outdoor installation, resulting in coating damage, and it is necessary to reduce the risk through structural design optimization or regular maintenance.

If the environment is highly corrosive, corrosion-resistant materials such as ferrites can be used first, or high-temperature rare earth permanent magnets such as samarium cobalt can be used. Protective processes such as electrophoretic coating and Parylene coating can be added to NdFeB magnets, or complete isolation can be achieved through packaging technology. Develop targeted selection and maintenance plans based on the temperature, humidity, chemical media and mechanical stress conditions of specific application scenarios.