Improvement of corrosion resistance in Nd-Fe-B magnets through grain boundaries restructuring

Junjie Ni; Tianyu Ma; Mi Yan

doi:10.1016/j.matlet.2012.01.100

Improvement of corrosion resistance in Nd-Fe-B magnets through grain boundaries restructuring

Junjie Ni
, Tianyu Ma
, Mi Yan

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

55 Scopus citations

Abstract

Nd-Fe-B sintered magnets exhibit poor corrosion resistance due to the large electrochemical potential difference between the Nd ₂Fe ₁₄B matrix and the Nd-rich intergranular phase. This letter presents a new approach to improve corrosion resistance of (Pr,Nd)-Fe-B sintered magnets in both humid atmosphere and acidic environment through replacing the (Pr,Nd)-rich intergranular phase by a (Pr,Nd) ₆Fe ₁₃Cu one, which can reduce significantly the electrochemical potential difference. Mass loss for the restructured magnets is less than 1.0 mg/cm ² after exposure to heat/humid atmosphere for 96 h. Corrosion resistance in 0.005 M H ₂SO ₄ solutions can also be significantly improved. In addition, the magnets still possess outstanding magnetic properties, with a maximum energy product (BH) _max of ~ 384 kJ/m ³, demonstrating that the grain boundaries restructuring is a competitive method to fabricate corrosion-resistant Nd-Fe-B sintered magnets.

Original language	English
Pages (from-to)	1-3
Number of pages	3
Journal	Materials Letters
Volume	75
DOIs	https://doi.org/10.1016/j.matlet.2012.01.100
State	Published - 15 May 2012
Externally published	Yes

Keywords

Corrosion
Magnetic properties
Nd-Fe-B
Sintered magnets

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10.1016/j.matlet.2012.01.100

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title = "Improvement of corrosion resistance in Nd-Fe-B magnets through grain boundaries restructuring",

abstract = "Nd-Fe-B sintered magnets exhibit poor corrosion resistance due to the large electrochemical potential difference between the Nd 2Fe 14B matrix and the Nd-rich intergranular phase. This letter presents a new approach to improve corrosion resistance of (Pr,Nd)-Fe-B sintered magnets in both humid atmosphere and acidic environment through replacing the (Pr,Nd)-rich intergranular phase by a (Pr,Nd) 6Fe 13Cu one, which can reduce significantly the electrochemical potential difference. Mass loss for the restructured magnets is less than 1.0 mg/cm 2 after exposure to heat/humid atmosphere for 96 h. Corrosion resistance in 0.005 M H 2SO 4 solutions can also be significantly improved. In addition, the magnets still possess outstanding magnetic properties, with a maximum energy product (BH) max of \textasciitilde{} 384 kJ/m 3, demonstrating that the grain boundaries restructuring is a competitive method to fabricate corrosion-resistant Nd-Fe-B sintered magnets.",

keywords = "Corrosion, Magnetic properties, Nd-Fe-B, Sintered magnets",

author = "Junjie Ni and Tianyu Ma and Mi Yan",

year = "2012",

month = may,

day = "15",

doi = "10.1016/j.matlet.2012.01.100",

language = "英语",

volume = "75",

pages = "1--3",

journal = "Materials Letters",

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publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Improvement of corrosion resistance in Nd-Fe-B magnets through grain boundaries restructuring

AU - Ni, Junjie

AU - Ma, Tianyu

AU - Yan, Mi

PY - 2012/5/15

Y1 - 2012/5/15

N2 - Nd-Fe-B sintered magnets exhibit poor corrosion resistance due to the large electrochemical potential difference between the Nd 2Fe 14B matrix and the Nd-rich intergranular phase. This letter presents a new approach to improve corrosion resistance of (Pr,Nd)-Fe-B sintered magnets in both humid atmosphere and acidic environment through replacing the (Pr,Nd)-rich intergranular phase by a (Pr,Nd) 6Fe 13Cu one, which can reduce significantly the electrochemical potential difference. Mass loss for the restructured magnets is less than 1.0 mg/cm 2 after exposure to heat/humid atmosphere for 96 h. Corrosion resistance in 0.005 M H 2SO 4 solutions can also be significantly improved. In addition, the magnets still possess outstanding magnetic properties, with a maximum energy product (BH) max of ~ 384 kJ/m 3, demonstrating that the grain boundaries restructuring is a competitive method to fabricate corrosion-resistant Nd-Fe-B sintered magnets.

AB - Nd-Fe-B sintered magnets exhibit poor corrosion resistance due to the large electrochemical potential difference between the Nd 2Fe 14B matrix and the Nd-rich intergranular phase. This letter presents a new approach to improve corrosion resistance of (Pr,Nd)-Fe-B sintered magnets in both humid atmosphere and acidic environment through replacing the (Pr,Nd)-rich intergranular phase by a (Pr,Nd) 6Fe 13Cu one, which can reduce significantly the electrochemical potential difference. Mass loss for the restructured magnets is less than 1.0 mg/cm 2 after exposure to heat/humid atmosphere for 96 h. Corrosion resistance in 0.005 M H 2SO 4 solutions can also be significantly improved. In addition, the magnets still possess outstanding magnetic properties, with a maximum energy product (BH) max of ~ 384 kJ/m 3, demonstrating that the grain boundaries restructuring is a competitive method to fabricate corrosion-resistant Nd-Fe-B sintered magnets.

KW - Corrosion

KW - Magnetic properties

KW - Nd-Fe-B

KW - Sintered magnets

UR - https://www.scopus.com/pages/publications/84856882226

U2 - 10.1016/j.matlet.2012.01.100

DO - 10.1016/j.matlet.2012.01.100

M3 - 文章

AN - SCOPUS:84856882226

SN - 0167-577X

VL - 75

SP - 1

EP - 3

JO - Materials Letters

JF - Materials Letters

ER -

Improvement of corrosion resistance in Nd-Fe-B magnets through grain boundaries restructuring

Abstract

Keywords

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