The invention belongs to the technical field of permanent
magnet materials, and particularly relates to a high-
corrosion-resistance permanent
magnet rich in high-abundance
rare earth and a preparationmethod of the high-
corrosion-resistance permanent
magnet rich in the high-abundance
rare earth. The high-
corrosion-resistance permanent magnet rich in the high-abundance
rare earth comprises a strongmagnetic phase and a
crystal boundary rare-earth-rich phase, wherein the strong
magnetic phase e is an MM-Fe-B phase, and the
crystal boundary rare-earth-rich phase is an MM-Fe phase. According to the method for preparing the permanent magnet, through a double-
alloy process, an MM-Fe-B main phase
alloy and an MM-Fe auxiliary
alloy are prepared, smelted and crushed to prepare
powder; the preparedMM-Fe auxiliary alloy
powder is added into the main alloy to be evenly mixed according to the
mass percent of 1% to 5%; and orientation pressing,
sintering and heat treatment are conducted, and the finally sintered magnet is obtained. MM-Fe is introduced in a
crystal boundary, thus distribution of the crystal boundary rare-earth-rich phase can be optimized, the crystal boundary rare-earth-rich phase partially replaces an original crystal boundary phase prone to corrosion, the intrinsic corrosion resistance of the MM-Fe-B magnet is improved, through the method, the proportion of low-cost rare earth La / Ce in the magnet is further increased, the material cost is lowered, the technological process is simple, and the high-corrosion-resistance permanent magnet rich in high-abundance rare earth is suitable for scale production.