Almost every neodymium magnet is plated or coated, and as the most powerful permanent magnet, they are used in many different applications. However, they have physical properties and need to be plated or coated to protect them from damage. The following table shows the test data of different coatings.
| Type | Salt Spray Testing | PCT Testing | Thickness |
| Blue white zinc trivalent chromium Blue ZN3+ | 24~48hours | 5~8um | |
|
Color zinc trivalent chromium Color ZN 3+ |
72hours | 5~8um | |
|
Color zinc trivalent chromium Color ZN 6+ |
96hours | 5~8um | |
| White zinc | 1~2hours | 5~8um | |
|
Normal roll coating (Ni,NiCuNi,Black Ni,Cr,Au,Sliver) |
24~48hours | 24~48hours | 12~20um |
|
Increase roll coating (Ni,NiCuNi,Black Ni,Cr,Au,Sliver) |
72~96hours | 72~96hours | 15~25um |
|
Normal hang coating (Ni,NiCuNi,Black Ni,Cr,Au,Sliver) |
12~18hours | 24~36hours | 20~30um |
|
Increase hang coating (Ni,NiCuNi,Black Ni,Cr,Au,Sliver) |
24~36hours | 48~72hours | 25~40um |
| Roll coating(Ni+Sn) | 48~72hours | 48~72hours | 15~25um |
| Hang coating(Ni+Sn) | 24~48hours | 24~48hours | 23~33um |
| EPOXY | 72~120hours | 10~20um | |
| NI+EPOXY | 96~150hours | 72~120hours | 20~40um |
| ZN+EPOXY | 96~150hours | 15~25um |
-
Black Ni Coaitng -
Phosphating Coating -
Au Coating -
Black Epoxy Coating -
Blue and White Zn Coating -
Cr Coating -
Silver Coating -
Colour Zn Coating
Neodymium magnets have many coatings to choose from to prevent damage and corrosion. Include nickel, copper, chromium, gold, black zinc and epoxy resin,etc. The coating on the magnet is very thin, so it has little effect on the magnetic properties of the magnet itself.