Surface Treatment

Neodymium magnets have poor resistance to corrosion. In order to protect the neodymium magnet from corrosion, usually, neodymium magnet will be plated.
The most common coating for Neodymium magnets is Nickel + Copper + Nickel (Ni + Cu + Ni). This coating offers the magnet relatively good protection from corrosion and passive applications. If the magnet will be exposed to moisture or liquid then consider the use of an organic coating such as Epoxy. A hard wearing coating, Epoxy is suited to applications where the magnet will come under some friction or knocking. Meanwhile, other options for coating are Color Zinc, Zinc, Epoxy resin, Silver, Gold, Tin, and so on.

Surface Coating of Neodymium Magnet

Type Plating Thickness(microns) Color Resistance
Nickel Ni  10-25 Bright Silver Excellent against Humidity
Ni+Cu+Ni
Ni+Epoxy resin Black,  Grey
Zinc Zn 8-15 Bright Blue Good Against Salt Spray
C+Zn Light Blue Tint
Znic  Cr3+ Zn 8-15 Bright Blue Good Against Salt Spray
C+Zn Light Blue Tint Excellent Against Salt Spray
Epoxy Epoxy 15-25 Black, Grey Excellent Against Humidity & Salt Spray
Ni+Cu+Epoxy
Zn+Epoxy
Tin Ni+Cu+Sn 15-20 Silver Superior Against Humidity
Au Ni+Cu+Au  10-20 Gold Superior Against Humidity
Ag Ni+Ag  10-20 Silver Superior Against Humidity
Parylene Parylene 5 -20 Transparent Superior corrosion & Salt Spray
Passivation No coating 1- 3 Silver Grey Temporary Protection
Phosphate No Coating 1- 3 Silver Grey Temporary Protection

1. Nickle Coating Neodymium Magnet

Coating Neodymium Magnet (1)  Coating Neodymium Magnet (2)  Coating Neodymium Magnet (3)

2. NiCuNi Coating Strong Magnets

Coating Strong Magnets (1)  Coating Strong Magnets (2)  Coating Strong Magnets (3)

3. Grey Epoxy Resin Coating Neodymium Ring Magnet

Coating Neodymium Ring Magnet (1)  Coating Neodymium Ring Magnet (2)  Coating Neodymium Ring Magnet (3)

4. Black Epoxy Resin Coating NdFeB Magnet

Black Epoxy Resin Coating NdFeB Magnet (1)  Black Epoxy Resin Coating NdFeB Magnet (2)  Black Epoxy Resin Coating NdFeB Magnet (3)

5. Au coating (golden)  Neo Magnet

Au coating (golden) Neo magnet (1)  Au coating (golden) Neo magnet (2)  Au coating (golden) Neo magnet (3)

6. Zinc Coaitng Neodymium Iron Boron Magnet

Zinc Coaitng Neodymium Iron Boron Magnet (1)  Zinc Coaitng Neodymium Iron Boron Magnet (2)  Zinc Coaitng Neodymium Iron Boron Magnet (3)

7. Color Zinc Coating  Rare Earth Magnet

Color Zinc Coating Rare Earth Magnet (1)  Color Zinc Coating Rare Earth Magnet (2)  Color Zinc Coating Rare Earth Magnet (3)

8. Ag Coating  Permanent Magnets

Ag Coating Permanent Magnets (1)  Ag Coating Permanent Magnets (2)  Ag Coating Permanent Magnets (3)