Abstract
The effect of composition and processing parameters of sintered Nd-Fe-B-type permanent magnets on the parameters of hydrogen absorption and desorption were studied. The interaction of these alloys with hydrogen is strongly related to the alloy composition. The results show that the decrepitation of the magnets containing different alloy additions depends not only on the amount of hydrogen absorbed but also on the form of its occurrence. The lowest absorption of hydrogen, in comparison to that of high-strength steels, has been found for the Nd₁₅Dy₁Fe_69.5Co₅ (W, Re)_1.5Zr_0.5B_7.5 permanent magnet.

Key words
Re-Fe-B permanent magnets, electrochemical hydrogenation, hydrogen desorption kinetics

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