RESIN BONDED MAGNET AND METHOD FOR MANUFACTURING THE SAME

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PROBLEM TO BE SOLVED : To provide a resin bonded magnet in which not only corrosion resistance against high temperature and high humidity but also excellent corrosion resistance against salt water can be improved, and high magnetic characteristics capable of reducing not only the generation of rust due to oxidation but also the deterioration of magnetic characteristics can be obtained.SOLUTION : Rare-earth magnetic powder and bonding resin are mixed with each other by a mixing process 1, the surface of a resin bonded magnet body molded by a compression molding process 2 is etched by alkalescent etching process 3, the etched resin bonded magnet body is treated with phosphate by a phosphate treatment process 4 using zinc phosphate group or manganese phosphate group phosphate, and then a resin film is formed on the surface of the resin bonded magnet body after the phosphate treatment. Consequently, a resin bonded magnet of high corrosion resistance can be obtained in which Zn3(PO4)2/4H2O and/or Zn2M(PO4)2/4H2O (where M contains Mn as an essential element and contains one element out of Ni and Fe) exists on the surface of the resin bonded magnet body and a resin film is formed on the surface.