Does SmCo magnets need coating?

nicked coated SmCo magnets

We all know that NdFeB magnets without coating rust easily. Does Samarium-cobalt magnets rust? If it rusts, will it have an effect on its magnetic performance? And how to prevent samarium cobalt magnets from rusting?

Will samarium-cobalt magnets rust?
Samarium-cobalt magnets also rust because both SmCo5 and Sm2Co17 contain iron. However, compared with neodymium-iron-boron, the iron content is relatively low, so the rust is not a serious issue. If the samarium-cobalt magnet is used in the sea, rust spots will form on the surface. But the magnetic performance will not change and the magnet can still be used.

Why should samarium-cobalt magnets be coated?
Samarium-cobalt magnets can be coated. Coating types include nickel, zinc, nickel-copper-nickel, epoxy, etc. But what’s the reasons for the coating? Doesn’t it increase the cost of the magnets? As a matter of fact, coating samarium-cobalt magnets offer three main advantages:

  • Better surface quality. In some applications, the surface quality of SmCo magnets is important because it can be used as a decoration. With surface coating, samarium-cobalt magnet does not look powdery anymore. Instead, the surface will have a shiny look.
  • Better anti-corrosion ability. Though the corrosion-resistance ability of samarium-cobalt magnets is relatively strong, it can always be better with a layer of coating.
  • Shatterproof. Samarium-cobalt magnets are more fragile than NdFeB magnets. Coatings can effectively solve the fragility problem as it functions as a protection layer.

Coating types for SmCo magnets we can provide are zinc, nickel, silver, copper, chemical nickel, nickel+copper+nickel (NiCuNi), nickel+gold, nickel+tin, epoxy.

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