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Neodymium magnets coating

Neodymium magnets coating

Neodymium magnets coating is used to protect the neodymium magnets. Sintered Neodymium is highly prone to oxidation and corrosion. Therefore the use of different coatings is essential for protection. These improve the magnet’s lifespan and ensure a high-quality product.

Plating is done after machining. It is done in different factory because of environmental laws. The plated neo magnets are then sent back to the factory for inspections.

In recent years special passivated alloys such as HAST have been developed which arrest the oxidation process without the magnet needing a more traditional, thick plating – this is coded NCNd in Magma.

Neodymium magnets coating types:


Surface treatmentTypeTypical thicknessColorRemarksRecommended max. temperature
Nickel coatingNi+NI



10-20 µm

Silver (semi bright)Excellent resistance to humid atmosphere





Ni+Cu+NIsuperior resistance to humid atmosphere
Zinc coatingBlue Zn8-20 µmSilver blueGood resistance to salt spray



Color ZnExcellent resistance to salt spray
Tin coatingNi+Cu+Sn15-20 µmSilver semi brightsuperior resistance to humid atmosphere160°C
Cupper coatingNi+Cu10-20 µmGold shiningTemporary treatment 
EpoxyNi+Cu+epoxy15-25 µmblackExcellent climatic and salt spray resistance



Single epoxy
Chemical coatingNi10-20 µmSilver semi brightExcellent resistance to humid atmosphere 
Passivation 0.1-0.3 µmSilver grayTemporary protection240°C


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