corrosion-resistant characteristic rare earth type total permanent magnet

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A rare earth-iron-boron permanent magnet such as neodymium-iron-boron permanent magnet can be imparted with high corrosion resistance by forming a corrosion-resistant coating layer on the surface comprising an alkali silicate, e.g., sodium silicate or lithium silicate, and a thermosetting resin such as melamine, epoxy and acrylic resins in uniform admixture.