Abstract
The Al thin film of about 10 μm was coated on the surface of the sintered Nd11.0Dy2.5Fe79.5Co1B 6 magnetic alloy, hereinafter described as the Nd-Fe-B specimen, and the effect of the Al thin film coating on the corrosion resistance of Nd-Fe-B permanent magnets has been investigated through the electrochemical measurements and XPS analysis. The glass peening on the Al thin film was also carried out, and its effect on the corrosion resistance was studied. Both of the Al-coated and Al-coated + glass-peened specimens showed the natural electrode potentials of -1.00 and -0.97 V which were slightly lower than -0.94 V of the Nd-Fe-B specimen. Comparing the natural electrode potentials of these three specimens, that of pure Al was remarkably low of -0.13 V. It was therefore considered that the corrosion solution penetrated to the surface of the Nd-Fe-B specimen through the Al-coated film formed on it. The XPS analysis showed that Si existed on the surface of the Al-coated + glass-peened specimen, which indicated that the glass peening treatment deteriorated the Al-coated film for the corrosion resistance.
| Original language | English |
|---|---|
| Pages (from-to) | 1426-1428 |
| Number of pages | 3 |
| 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
- Corrosion resistance
- Glass peening
- Nd-Fe-B permanent magnet
- Potentiodynamic polarization curve
- Thin film Al coating
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry