Abstract
Effect of Co addition on improving the corrosion resistance of Nd 11.8Fe82.3-xCoxB5.9 specimens with different x (x = 0, 2.5, 5.0, 7.5, 10.0) have been investigated through the electrochemical method including the impedance measurement. With increasing amount of Co content the natural electrode potential shifted to nobler side. The Nyquist plot showing a semi circle in which frequency increases in counter clockwise direction was obtained. From the result it was clarified that the diameter of the semi circle corresponding to the charge transfer resistance, Rct, became larger with increasing Co content, which indicates the improvement of the corrosion resistance for the Nd11.8Fe 82.3-xCoxB5.9 specimens by Co addition because the Rct is inversely proportional to the corrosion rate. Judging from these results it is suggested that the impedance measurement is one of the effective methods to obtain the information of corrosion behavior for the Nd11.8Fe82.3-xCoxB5.9 specimens.
| Original language | English |
|---|---|
| Pages (from-to) | 1373-1376 |
| Number of pages | 4 |
| Journal | Journal of Alloys and Compounds |
| Volume | 408-412 |
| DOIs | |
| State | Published - 2006/02/09 |
| Event | Proceedings of the Rare Earths'04 in Nara, Japan - Duration: 2004/11/07 → 2004/11/12 |
Keywords
- Charge transfer resistance
- Corrosion resistance
- Immersion test
- Nd-Fe-B magnet
- Nyquist plot
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry