Surface Coating

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

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.