耐食性を改善したr−tm−b系永久磁石の製造方法

Manufacture of r-tm-b series permanent magnet having improved corrosion resistance

Abstract

PURPOSE:To remarkably improve corrosion resistance insufficient in conventional plating in a magnet containing rare earth elements and iron as main ingredients. CONSTITUTION:A method for manufacturing an R-TM-B series permanent magnet having improved corrosion resistance comprises the step of electrolytically processing with a current density of 0.5-5A/dm<2> simultaneously during an electrolessly plating for the purpose of improving corrosion resistance of the R-TM-B series permanent magnet containing by weight ratio 5-40% of R (R is a combination of one or more types of rare earth elements including y), 50-90% of TM (TM is transition metal containing Fe as a main ingredient) and 0.2-8% of B (boron).
(57)【要約】 【目的】希土類と鉄を主体とした磁石において、従来の めっきでは不十分であった耐食性の顕著な向上するこ と。 【構成】 重量比でR(ここでRは、Yを含む希土類元 素の1種又は2種以上組合わせ)5〜40%,TM(こ こでTMはFeを主体とする遷移金属)50〜90%, B(硼素)0.2〜8%からなるR−TM−B系永久磁 石の耐食性改善を目的として設ける無電解めっき処理中 に同時に電流密度0.5〜5A/dm 2 の電解処理を施 すことを特徴とする耐食性を改善したR−TM−B系永 久磁石の製造方法である。

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