Sintered NdFeB Magnets, Strong Magnets Made in China

China Rare Earth Magnet Limited manufactures sintered NdFeB magnets in all producible grades series of N35~N52, N30M~N50M, N30H~N48H, N30SH~N45SH, N28UH~N40UH, N28EH~N38EH and N30AH~N35AH. For the time being, Sintered NdFeB magnets are still the strongest permanent magnets with very high magnetic energy and good coercive force in the world.

However, neodymium magnets themselves are not good in resistance to oxidation and corrosion as ferrite magnets, SmCo magnets and Alnico magnets. Uncoated neodymium rare earth magnets go rusting quickly in external environmental conditions. Most of customers need neodymium iron boron magnets with plating and we suggest customers ordering coated NdFeB magnets as well. Commonly used coatings are Ni-Cu-Ni, Zn, Single Nickel, black epoxy and grey epoxy. Some customers choose composite coatings like Zn+ black/grey epoxy, Ni-Cu-Ni+ black epoxy for a much better protection on their magnets. A small number of users require uncoated neodymium permanent magnet for their applications of vacuum environment. Uncoated ones will be packed in sealing vacuum packaging to avoid rusting in transportation. Some applications have strict requirements on magnetism, the users ask for phosphating or passivating process on magnets instead of plating.