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Available Coatings for Neodymium Magnets


Neodymium magnet( also known as NdFeB magnet) is the most commonly used rare earth magnet. NdFeB magnets are widely used in electronic and motor products. In order to avoid corrosion damage, it is necessary to protect the surface of neodymium magnets, Nickel-coated neodymium magnets,Zinc-coated neodymium magnets and Epoxy coated neodymium magnets are most common used.There are also other coatings suitable for neodymium magnets.

The following table describes the coating suitable for NdFeB magnets.


Surface

Coating

Thickness (Microns)

Color

Resistance

Passivation


1

Silver Grey

Temporary Protection

Nickel

Ni+Ni

10-20

Bright Silver

Excellent Against Humidity

Ni+Cu+Ni

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

Silver

Ni+Cu+Ag

10-20

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&Salt Spray

Ni+Cu+Epoxy

Zn+Epoxy

Parylene

Parylene

5-20

Grey

Excellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved

Chemical

Ni

10-20

Silver Grey

Excellent Against Humidity




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