An electrodeposition method, an electrodeposition liquid and the production of rare earth permanent

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The present invention discloses an electro-deposition process, an electro-deposition bath, and a method for preparing a rare earth permanent magnetic material through electro-deposition. The electro-deposition process is used for depositing a heavy rare earth element on the surface of a sintered R2-T-B type master alloy, and comprises Step 1 : providing an electro-deposition bath, comprising a main salt containing the heavy rare earth element, an induction salt for inducing the heavy rare earth element to deposit, and an organic ionic liquid as the solvent, wherein the main salt is a tetrafluoroborate of the heavy rare earth element; and Step 2 : electroplating the sintered R2-T-B type master alloy in the electro-deposition bath at a temperature of 0 to 200° C. The present invention has the following beneficial effects : deposition of the heavy rare earth element on the surface of the sintered R2-T-B type master alloy is rapid, so that the electro-deposition process time can be saved, and the production efficiency is improved. In addition, a higher plating thickness of up to 10 to 40 μm can be achieved.