TY - JOUR
T1 - Electrochemical behavior of aluminum-coated Nd-Fe-B alloy
AU - Majima, Kazuhiko
AU - Sunada, Satoshi
AU - Ito, Hisanori
AU - Kaneko, Yuji
N1 - Funding Information:
The authors are grateful to Takahashi Industrial and Economic Research Foundation for their financial contribution.
PY - 2006/2/9
Y1 - 2006/2/9
N2 - 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.
AB - 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.
KW - Corrosion resistance
KW - Glass peening
KW - Nd-Fe-B permanent magnet
KW - Potentiodynamic polarization curve
KW - Thin film Al coating
UR - http://www.scopus.com/inward/record.url?scp=31144456673&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2005.04.053
DO - 10.1016/j.jallcom.2005.04.053
M3 - 会議記事
AN - SCOPUS:31144456673
SN - 0925-8388
VL - 408-412
SP - 1426
EP - 1428
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
T2 - Proceedings of the Rare Earths'04 in Nara, Japan
Y2 - 7 November 2004 through 12 November 2004
ER -