Surface treatment of neodymium magnets is an important process to be able to protect the magnet again corrosion. The substrate NdFeB (Neodymium, Iron, Boron) oxidizes rapidly without protective coatings. Below you will find a table with the most common surface treatments. Please contact us if you have any questions!
NPM - North Pole Marked - A marking on the North pole of the magnet - does not affect tolerance SPM - South Pole Marked -A marking on the South pole of the magnet - does not affect toleranceMaterial | Salt spray test | Thickness | Appearance | Properties |
---|---|---|---|---|
NickelNi-Cu-Ni | > 48 hr | 10 - 30 µm | Silver shiny |
|
Zink Zn | > 24 hr | 6 - 15 µm | Silver/blue Shiny |
|
EpoxyNi-Cu-Epoxy | > 96 hr | 10 - 30 µm | Black shiny |
|
GoldNi-Cu-Au | > 12 hr | 10 - 15 µm | Gold shiny |
|
Rilsan | < 1mm corrosion after 2000 hr | Black shiny |
|
|
Parylene | > 96 hr | 3 - 10 µm | Transparent |
|
Rubber | 0.5 - 1 mm | Black |
|
|
Phosphated | 1 - 3 µm | Silver gray |
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