Rare earth magnet corrosion

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PROBLEM TO BE SOLVED : To provide a corrosion-resistant high-performance rare earth permanent magnet at a low cost. SOLUTION : Fine powder of at least one metal selected out of Al, Mg, Ca, Zn, Si, Mn, and alloy thereof and an oxide of one or more elements selected out of Si, Mn, Zn, Mo, Cr, and P are compounded into a composite, the composite is formed into a corrosion-resistant film, and the film is provided on the surface of a rare earth permanent magnet of R-T-M-B (R is, at least, a rare earth element including Y, T denotes Fe or Fe and Co, and M is at least one element selected out of Ti, Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Zr, Cr, Ni, Cu, Ga, Mo, W, and Ta, and the contents of the elements are represented as follows : 5 wt.%<=R<=40 wt.%, 50 wt.%<=T<=90 wt.%, 0.1 wt.%<=M<=8 wt.%, and 0.2 wt.%<=B<=80 wt.%).