Corrosion-resistant rare earth magnets are produced by forming, on the surface of an R-T-M-B rare earth permanent magnet, (i) a flaky fine powder/metal oxide composite film by applying a treatment fluid containing a flaky fine powder and a metal sol to the surface of the magnet and heating the resulting magnet, (ii) a composite film composed of a flaky fine powder and a product of heat treatment of a silane and/or partial hydrolyzate thereof by applying a treatment fluid containing a flaky fine powder and a silane and/or partial hydrolyzate thereof to the surface of the magnet and heating the resulting magnet, or (iii) a flaky fine powder/alkali silicate glass composite film by applying a treatment fluid containing a flaky fine powder and an alkali silicate to the surface of the magnet and heating the resulting magnet. |