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Coatings for Neodymium Magnets

Special requirements of an application or the magnet material itself – NdFeB in non-corrosive design – can make it necessary to provide magnets with a coating. However, there is no universal coating, the respective coating must be adapted to the application. 

Metallic and Organic coating for neodymium magnets

  • Metallic coatings offer good protection against moisture and vapor, especially as multiple layers. But they can still be damaged in corrosive media. Metallic coatings such as Nickel coating are suitable for all sintered neodymium magnets.
  • Organic coatings are more resistant to aggressive media, but are usually less suitable for mechanical loads on the magnets. Organic coatings can be used on all types of permanent magnets.

Coating type

Thick (μm)

Color

WorkingTemp. (°C)

PCT (h)

SST (h)

Characteristics

White Zn

5-20

Blue and White

≤160

≥48

Anodic coating, low cost

Colored Zn

5-20

Iridescent

≤160

≥72

Anodic coating, low cost

NiCuNi

10-30

Silver White

≤390

≥96

≥48

High temperature resistance

PVD Al

5-25

Silver White

≤390

≥96

≥96

Excellent adhesive force,
high temperature resistance

Epoxy

15-25

Black

≤200

≥360

Insulation, excellent thickness consistency

NiCu+Epoxy

20-40

Black

≤200

≥480

≥720

Insulation, excellent salt spray resistance

NiCuNi+Au

10-30

Golden

≤200

≥480

≥72

good for decoration, excellent durability,
common in medical applications

Spray Epoxy

10-30

Black

≤200

≥192

≥504

Insulation, high temperature resistance

Phosphating

≤250

≥0.5

low cost, temperory protection

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Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.