Electrochemical Passivation for Sm2Fe17N3 Magnetic Powders in Non-Aqueous Solvents

Mariko Kadowaki; Izumi Muto; Yu Sugawara; Takashi Ishikawa; Yukinobu Yoneyama; Nobuyoshi Hara

doi:10.1016/j.electacta.2016.12.084

Electrochemical Passivation for Sm₂Fe₁₇N₃ Magnetic Powders in Non-Aqueous Solvents

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Takashi Ishikawa, Yukinobu Yoneyama, Nobuyoshi Hara

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Potentiodynamic polarization measurements for Sm₂Fe₁₇N₃ magnetic powders in organic solvents with H₃PO₄ were performed to determine which additives promote passivation in the ball-milling process and improve the coercivity of the ball-milled powders at high temperatures. Surface films that contained FePO₄ formed on the Sm₂Fe₁₇N₃ powders in the solvents with H₃PO₄ and inhibited the dissolution reaction during anodic polarization. It would appear that the FePO₄-containing surface film acts as a barrier against oxidation at high temperatures. It was demonstrated that the addition of either PO(OCH₃)₃ or HNO₃ to an isopropyl alcohol solution in the ball-milling process suppressed the decrease in coercivity above 500 K.

Original language	English
Pages (from-to)	386-396
Number of pages	11
Journal	Electrochimica Acta
Volume	224
DOIs	https://doi.org/10.1016/j.electacta.2016.12.084
Publication status	Published - 2017 Jan 10

Keywords

FePO-containing surface film
SmFeN powder

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

Access to Document

10.1016/j.electacta.2016.12.084

Cite this

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title = "Electrochemical Passivation for Sm2Fe17N3 Magnetic Powders in Non-Aqueous Solvents",

abstract = "Potentiodynamic polarization measurements for Sm2Fe17N3 magnetic powders in organic solvents with H3PO4 were performed to determine which additives promote passivation in the ball-milling process and improve the coercivity of the ball-milled powders at high temperatures. Surface films that contained FePO4 formed on the Sm2Fe17N3 powders in the solvents with H3PO4 and inhibited the dissolution reaction during anodic polarization. It would appear that the FePO4-containing surface film acts as a barrier against oxidation at high temperatures. It was demonstrated that the addition of either PO(OCH3)3 or HNO3 to an isopropyl alcohol solution in the ball-milling process suppressed the decrease in coercivity above 500 K.",

keywords = "FePO-containing surface film, SmFeN powder",

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T1 - Electrochemical Passivation for Sm2Fe17N3 Magnetic Powders in Non-Aqueous Solvents

AU - Kadowaki, Mariko

AU - Muto, Izumi

AU - Sugawara, Yu

AU - Ishikawa, Takashi

AU - Yoneyama, Yukinobu

AU - Hara, Nobuyoshi

PY - 2017/1/10

Y1 - 2017/1/10

N2 - Potentiodynamic polarization measurements for Sm2Fe17N3 magnetic powders in organic solvents with H3PO4 were performed to determine which additives promote passivation in the ball-milling process and improve the coercivity of the ball-milled powders at high temperatures. Surface films that contained FePO4 formed on the Sm2Fe17N3 powders in the solvents with H3PO4 and inhibited the dissolution reaction during anodic polarization. It would appear that the FePO4-containing surface film acts as a barrier against oxidation at high temperatures. It was demonstrated that the addition of either PO(OCH3)3 or HNO3 to an isopropyl alcohol solution in the ball-milling process suppressed the decrease in coercivity above 500 K.

AB - Potentiodynamic polarization measurements for Sm2Fe17N3 magnetic powders in organic solvents with H3PO4 were performed to determine which additives promote passivation in the ball-milling process and improve the coercivity of the ball-milled powders at high temperatures. Surface films that contained FePO4 formed on the Sm2Fe17N3 powders in the solvents with H3PO4 and inhibited the dissolution reaction during anodic polarization. It would appear that the FePO4-containing surface film acts as a barrier against oxidation at high temperatures. It was demonstrated that the addition of either PO(OCH3)3 or HNO3 to an isopropyl alcohol solution in the ball-milling process suppressed the decrease in coercivity above 500 K.

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