TY - JOUR
T1 - Effect of Si addition on the corrosion properties of amorphous Fe-based soft magnetic alloys
AU - Dan, Zhenhua
AU - Takenaka, Kana
AU - Zhang, Yan
AU - Unami, Shigeru
AU - Takeuchi, Akira
AU - Hara, Nobuyoshi
AU - Makino, Akihiro
N1 - Funding Information:
This work was supported by “Tohoku Innovative Materials Technology Initiatives for Reconstruction (TIMT)” funded by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) and Reconstruction Agency, Japan . ZH Dan thanks Prof. Nishijima for his TEM observation.
PY - 2014/10/15
Y1 - 2014/10/15
N2 - Effects of an addition of Si and P into amorphous Fe85.2B 14Cu0.8 based soft magnetic alloys were investigated in boric-borate buffer solution. The addition of P decreased the passive current density effectively. Substituting Si for P in Fe85.2Si xB9P5 - xCu0.8 (x = 0, 1, 2 at.%) alloys further improved corrosion resistance. After the removal of the oxide films, the passive current density was higher than those covered by the oxide films. The lowest passive current density was observed at 5 × 10 - 6 A/cm2 on the Fe85.2Si1B 9P4Cu0.8 alloy. On the other hand, the pitting potential of the alloys before and after removal of the oxide films was as high as about 0.96 V and was independent of chemical composition of the alloys. The addition of Si and P could enhance the corrosion resistance of Fe 85.2SixB9P5 - xCu0.8 alloys via modification of the chemical composition of the oxide films. Cyclic voltammetric results indicated that the addition of Si suppressed the formation rate of bivalent Fe species, which slows down reaction rates of this rate-determining step.
AB - Effects of an addition of Si and P into amorphous Fe85.2B 14Cu0.8 based soft magnetic alloys were investigated in boric-borate buffer solution. The addition of P decreased the passive current density effectively. Substituting Si for P in Fe85.2Si xB9P5 - xCu0.8 (x = 0, 1, 2 at.%) alloys further improved corrosion resistance. After the removal of the oxide films, the passive current density was higher than those covered by the oxide films. The lowest passive current density was observed at 5 × 10 - 6 A/cm2 on the Fe85.2Si1B 9P4Cu0.8 alloy. On the other hand, the pitting potential of the alloys before and after removal of the oxide films was as high as about 0.96 V and was independent of chemical composition of the alloys. The addition of Si and P could enhance the corrosion resistance of Fe 85.2SixB9P5 - xCu0.8 alloys via modification of the chemical composition of the oxide films. Cyclic voltammetric results indicated that the addition of Si suppressed the formation rate of bivalent Fe species, which slows down reaction rates of this rate-determining step.
KW - Amorphous alloy
KW - Soft-magnetic alloy
KW - X-ray photoelectron spectroscopy
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U2 - 10.1016/j.jnoncrysol.2014.05.007
DO - 10.1016/j.jnoncrysol.2014.05.007
M3 - Article
AN - SCOPUS:84902127875
SN - 0022-3093
VL - 402
SP - 36
EP - 43
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
ER -