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Surface Coating

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 Picture Plating Thickness(microns) Color Resistance
Nickel    1.jpg Ni  10-25    Bright Silver   Excellent against Humidity   
Ni+Cu+Ni
Ni+Epoxy resin Black,  Grey
Zinc   1.jpg Zn 8-15    Bright Blue Good Against Salt Spray  
C+Zn Light Blue Tint
Znic  Cr3+   1.jpg Zn 8-15    Bright Blue Good Against Salt Spray
C+Zn Light Blue Tint Excellent Against Salt Spray
Epoxy    1.jpg Epoxy 15-25    Black, Grey    Excellent Against Humidity & Salt Spray 
Ni+Cu+Epoxy
Zn+Epoxy
Tin 1.jpg Ni+Cu+Sn 15-20 Silver Superior Against Humidity
Au 1.jpg Ni+Cu+Au  10-20  Gold Superior Against Humidity
Ag 1.jpg Ni+Ag  10-20 Silver Superior Against Humidity
Everlube 1.jpg    Ni+Cu+Everlube 10-20 Pale Gold Superior corrosion & Salt Spray 
IVD AI 1.jpg AI  5-25 Silver White Excellent adhesive force, high temperature resistance
Parylene 1.jpg Parylene 5 -20  Transparent Superior corrosion & Salt Spray
Passivation 1.jpg No coating 1- 3  Silver Grey Temporary Protection