Coating of Neodymium magnet(Nib or ndfeb magnet)
Unlike Samarium Cobalt, Alnico and ceramic materials, which are corrosion resistant,the sintered neodymium-iron-boron permanent magnet is a chemically active powder metallurgical material, which is characteristic of being hard and brittle easy oxidized and corroded. Based on it's features the most effective way is apply surface or coating As on the surface of sintered NdFB magnetic material, empty holes or oxidization phase
occurred by matching may exist .The surface treatment should undergo pre-treatment procedure and have appropriate plating.
Surface |
Coating |
Thickness (Microns) |
Color |
Resistance effect |
Passivation |
1 |
Silver Grey |
Temporary Protection |
|
Nickel |
Ni+Ni |
10-20 |
Bright Silver |
Excellent against Humidity |
Ni+Cu+Ni |
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Zinc |
Zn |
8-20 |
Bright Blue |
Good Against Salt Spray |
C-Zn |
Shinny Color |
Excellent Against Salt Spray |
||
Tin |
Ni+Cu+Sn |
15-20 |
Silver |
Superior Against Humidity |
Gold |
Ni+Cu+Au |
10-20 |
Gold |
Superior Against Humidity |
Copper |
Ni+Cu |
10-20 |
Gold |
Temporary Protection |
Epoxy |
Epoxy |
15-25 |
Black, Red, Grey |
Excellent Against Humidity |
Ni+Cu+Epoxy |
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Zn+Epoxy |
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Chemical |
Ni |
10-20 |
Silver Grey |
Excellent Against Humidity |
Parylene |
Parylene |
5-20 |
Grey |
Excellent Against Humidity, Salt Spray.Superior Against Solvents, Gases, Fungi and Bacteria.FDA Approved. |