Coatings for Neodymium Magnets: Nickel, Zinc, Epoxy, etc.

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

Coatings for Neodymium Magnets

Metallic and Organic coating for neodymium magnets

© 2022 Hangzhou Tengye Magnetic Materials Co., Ltd.

Inquiry Form