Effects of high-pressure torsion on the pitting corrosion resistance of aluminumiron alloys

Hiroaki Nakano, Hiroto Yamaguchi, Yohei Yamada, Satoshi Oue, In Joon Son, Zenji Horita, Hiroki Koga

研究成果: ジャーナルへの寄稿記事

4 引用 (Scopus)

抄録

The effects of reducing the grain size by high-pressure torsion (HPT) on the pitting corrosion resistance of AlFe alloys with Fe contents of 0.5, 2 and 5 mass% were investigated by means of polarization curves in solutions containing 0.1 mol̇dm-3 Na2SO4 and 8.46 mmol̇dm-3 NaCl (300 ppm Cl-) at 298K and by surface analysis. The potentials for pitting corrosion of the AlFe alloys were clearly shifted to the noble direction by HPT, leading to an improvement in pitting corrosion resistance. This improvement was larger in the Al0.5% Fe and Al2% Fe alloys and smaller in the Al5% Fe alloy. The AlFe alloys contained precipitates of AlFe intermetallic compounds, around which pitting corrosion occurred. The Al5% Fe alloy, in particular, contained large precipitates tens of micrometers in size, and pitting corrosion was significant around these large precipitates. It is evident from the time-dependence of the corrosion potential and the polarization resistance of the corrosion reaction that the formation rate of Al oxide films increases as a result of HPT. It was therefore concluded that the improvement in pitting corrosion resistance of the AlFe alloys with HPT is caused by increasing the oxidation rate of Al.

元の言語英語
ページ(範囲)1642-1649
ページ数8
ジャーナルMaterials Transactions
54
発行部数9
DOI
出版物ステータス出版済み - 1 1 2013

Fingerprint

pitting
Pitting
corrosion resistance
Torsional stress
torsion
Corrosion resistance
corrosion
Corrosion
Precipitates
precipitates
Polarization
Surface analysis
polarization
Oxide films
Intermetallics
time dependence
intermetallics
oxide films
micrometers
grain size

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Effects of high-pressure torsion on the pitting corrosion resistance of aluminumiron alloys. / Nakano, Hiroaki; Yamaguchi, Hiroto; Yamada, Yohei; Oue, Satoshi; Son, In Joon; Horita, Zenji; Koga, Hiroki.

:: Materials Transactions, 巻 54, 番号 9, 01.01.2013, p. 1642-1649.

研究成果: ジャーナルへの寄稿記事

Nakano, Hiroaki ; Yamaguchi, Hiroto ; Yamada, Yohei ; Oue, Satoshi ; Son, In Joon ; Horita, Zenji ; Koga, Hiroki. / Effects of high-pressure torsion on the pitting corrosion resistance of aluminumiron alloys. :: Materials Transactions. 2013 ; 巻 54, 番号 9. pp. 1642-1649.
@article{da7a03a465a24e9d96ed29b714f87f70,
title = "Effects of high-pressure torsion on the pitting corrosion resistance of aluminumiron alloys",
abstract = "The effects of reducing the grain size by high-pressure torsion (HPT) on the pitting corrosion resistance of AlFe alloys with Fe contents of 0.5, 2 and 5 mass{\%} were investigated by means of polarization curves in solutions containing 0.1 mol̇dm-3 Na2SO4 and 8.46 mmol̇dm-3 NaCl (300 ppm Cl-) at 298K and by surface analysis. The potentials for pitting corrosion of the AlFe alloys were clearly shifted to the noble direction by HPT, leading to an improvement in pitting corrosion resistance. This improvement was larger in the Al0.5{\%} Fe and Al2{\%} Fe alloys and smaller in the Al5{\%} Fe alloy. The AlFe alloys contained precipitates of AlFe intermetallic compounds, around which pitting corrosion occurred. The Al5{\%} Fe alloy, in particular, contained large precipitates tens of micrometers in size, and pitting corrosion was significant around these large precipitates. It is evident from the time-dependence of the corrosion potential and the polarization resistance of the corrosion reaction that the formation rate of Al oxide films increases as a result of HPT. It was therefore concluded that the improvement in pitting corrosion resistance of the AlFe alloys with HPT is caused by increasing the oxidation rate of Al.",
author = "Hiroaki Nakano and Hiroto Yamaguchi and Yohei Yamada and Satoshi Oue and Son, {In Joon} and Zenji Horita and Hiroki Koga",
year = "2013",
month = "1",
day = "1",
doi = "10.2320/matertrans.MH201301",
language = "English",
volume = "54",
pages = "1642--1649",
journal = "Materials Transactions",
issn = "0916-1821",
publisher = "The Japan Institute of Metals and Materials",
number = "9",

}

TY - JOUR

T1 - Effects of high-pressure torsion on the pitting corrosion resistance of aluminumiron alloys

AU - Nakano, Hiroaki

AU - Yamaguchi, Hiroto

AU - Yamada, Yohei

AU - Oue, Satoshi

AU - Son, In Joon

AU - Horita, Zenji

AU - Koga, Hiroki

PY - 2013/1/1

Y1 - 2013/1/1

N2 - The effects of reducing the grain size by high-pressure torsion (HPT) on the pitting corrosion resistance of AlFe alloys with Fe contents of 0.5, 2 and 5 mass% were investigated by means of polarization curves in solutions containing 0.1 mol̇dm-3 Na2SO4 and 8.46 mmol̇dm-3 NaCl (300 ppm Cl-) at 298K and by surface analysis. The potentials for pitting corrosion of the AlFe alloys were clearly shifted to the noble direction by HPT, leading to an improvement in pitting corrosion resistance. This improvement was larger in the Al0.5% Fe and Al2% Fe alloys and smaller in the Al5% Fe alloy. The AlFe alloys contained precipitates of AlFe intermetallic compounds, around which pitting corrosion occurred. The Al5% Fe alloy, in particular, contained large precipitates tens of micrometers in size, and pitting corrosion was significant around these large precipitates. It is evident from the time-dependence of the corrosion potential and the polarization resistance of the corrosion reaction that the formation rate of Al oxide films increases as a result of HPT. It was therefore concluded that the improvement in pitting corrosion resistance of the AlFe alloys with HPT is caused by increasing the oxidation rate of Al.

AB - The effects of reducing the grain size by high-pressure torsion (HPT) on the pitting corrosion resistance of AlFe alloys with Fe contents of 0.5, 2 and 5 mass% were investigated by means of polarization curves in solutions containing 0.1 mol̇dm-3 Na2SO4 and 8.46 mmol̇dm-3 NaCl (300 ppm Cl-) at 298K and by surface analysis. The potentials for pitting corrosion of the AlFe alloys were clearly shifted to the noble direction by HPT, leading to an improvement in pitting corrosion resistance. This improvement was larger in the Al0.5% Fe and Al2% Fe alloys and smaller in the Al5% Fe alloy. The AlFe alloys contained precipitates of AlFe intermetallic compounds, around which pitting corrosion occurred. The Al5% Fe alloy, in particular, contained large precipitates tens of micrometers in size, and pitting corrosion was significant around these large precipitates. It is evident from the time-dependence of the corrosion potential and the polarization resistance of the corrosion reaction that the formation rate of Al oxide films increases as a result of HPT. It was therefore concluded that the improvement in pitting corrosion resistance of the AlFe alloys with HPT is caused by increasing the oxidation rate of Al.

UR - http://www.scopus.com/inward/record.url?scp=84883223917&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84883223917&partnerID=8YFLogxK

U2 - 10.2320/matertrans.MH201301

DO - 10.2320/matertrans.MH201301

M3 - Article

VL - 54

SP - 1642

EP - 1649

JO - Materials Transactions

JF - Materials Transactions

SN - 0916-1821

IS - 9

ER -