Patent ID: 7156928

Claim:
A corrosion resistant rare earth magnet characterized by comprising a rare earth permanent magnet represented by R-T-M-B wherein R is at least one rare earth element inclusive of yttrium, T is iron or iron and cobalt, and M is at least one element selected from the group consisting of Ti, Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Zr, Cr, Ni, Cu, Ga, Mo, W, and Ta, the contents of the respective elements are 5 wt %≦R≦40 wt %, 50 wt %≦T≦90 wt %, 0 wt %≦M≦8 wt %, and 0.2 wt %≦B≦8 wt %, and a coating on a surface of the permanent magnet comprising a silicone resin, a flake metal fine powder of at least one metal selected from the group consisting of Al, Mg, Ca, Zn, Si and Mn and/or an alloy thereof, and at least one complexing agent selected from the group consisting of salts of boric acid, oxalic acid, phosphoric acid, phosphorous acid, hypophosphorous acid, silicic acid, phosphonic acid, phytic acid, molybdic acid, and phosphomolybdic acid.