Product information

Coatings for isotropic bonded SmFeN magnets (NITROQUENCH-P)

Compression molded NITROQUENCH-P shows better corrosion resistance than NdFeB counterparts. While these magnets kept in dry air will be rust free for a long time, in a humid environment, the moisture in the air will cause rust on the surface.

Therefore surface coating is necessary for most applications. Daido provides 5 types of coatings for your specific shape and use environment.

Due to higher polymer binder content, injection molded magnets have higher corrosion resistance and in most cases can be used without coatings.

Picture : magnet

Coating method Coating thickness
(µm)
Corrosion resistance
Time to rust formation in humidity test (hours)
Application shape
60℃×95%R.H. 80℃×95%R.H.
Resin coating Electrodeposition coating (epoxy) 20 ~ 35 500 300 Various shapes
Spray coating (epoxy) 15 ~ 30 400 200 Various shapes
Dip coating (epoxy) 1 ~ 5 100 50 Small parts
Barrel spray coating
(epoxy)
3 ~ 18 200 100 Small parts
Metal plating Ni plating 10 ~ 30 500 300 Various shapes

Please consult with our sales staff for details.