Magnet Coatings
Coating rare earth magnets is a crucial step in enhancing their performance and longevity. The coating acts as a protective shield, guarding against rust and degradation. Beyond preservation, coatings can improve the magnets’ resistance to temperature variations and mechanical stress, ensuring optimal functionality in diverse applications. Selecting the right coating is essential for maximizing the potential of these remarkable magnetic materials.
| PLATING / COATING | COLOR | THICKNESS |
Salt Spary Test (hr) |
Tw (°C) | PRICE | INDOOR USE |
ABRASION RESISTANCE |
HUMIDITY | WATER | SALTY AIR | SALTWATER |
GLUE ADHESION |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nickel (Ni-Cu-Ni) | Silver | 10-20 Microns | >48 | ≤230 | Low | Good | Good | Good | Acceptable | Acceptable | Acceptable | Acceptable |
| Black Epoxy (Ni-Cu-BE) | Black | 10-20 Microns | >48 | ≤230 | Medium | Best | Bad | Best | Best | Good | Good | Acceptable |
| Chemical Nickel (Ni-Cu-Ni-ChNi) | Silver | 10-20 Microns | >7 | ≤230 | High | Best | Good | Best | Best | Best | Best | Good |
| Teflon® (PTFE) | Blue | 250-500 Microns | >48 | ≤230 | High | Best | Best | Best | Best | Best | Best | Bad |
| Zinc (Zn) | Silver-Gray | 5-15 Microns | >24 | ≤160 | Low | Good | Acceptable | Acceptable | Acceptable | Bad | Bad | Good |
| Gold (Ni-Cu-Ni-Au) | Gold | 10-25 Microns | >48 | ≤230 | High | Good | Good | Good | Acceptable | Acceptable | Acceptable | Acceptable |
| Silver (Ni-Cu-Ni-Ag) | Silver | 10-25 Microns | >48 | ≤160 | High | Good | Good | Good | Acceptable | Acceptable | Acceptable | Acceptable |
| Tin (Ni-Cu-Ni-Sn) | Silver | 10-25 Microns | >72 | ≤160 | Medium | Good | Bad | Good | Acceptable | Good | Acceptable | Acceptable |
| Bare Epoxy (BE) | Black | 10-30 Microns | >72 | ≤120 | Medium | Best | Acceptable | Best | Best | Good | Good | Acceptable |
| Everlube® 6155 | Silver-Gold Satin | 8-25 Microns | >96 | ≤230 | High | Best | Best | Best | Best | Best | Best | Acceptable |
| Parylene (Parylene C) | Grey | 8-15 Microns | >96 | ≤230 | Medium | Good | Bad | Good | Acceptable | Good | Acceptable | Bad |
| Passivation (Surface Prep) | Grey | 0.1-0.5 Microns | N/A | ≤230 | Low | Acceptable | Acceptable | Bad | Bad | Bad | Bad | Best |
| Plastic (ABS) | Various | >800 Microns | N/A | ≤160 | High | Best | Best | Best | Best | Best | Best | Good |