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

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

Research output: Contribution to journalArticle

Abstract

The effects of reducing the grain size by high-pressure torsion HPT on the pitting corrosion resistance of Al-Fe alloys with Fe contents of 0.5, 2, and 5mass% were investigated by means of polarization curves in solutions containing 0.1 mol-dm-3 Na2SO4 and 8.46 mmol-dm -3 NaCl (300 ppm Cl-) at 298 K and by surface analysis. The potentials for pitting corrosion of the Al-Fe alloys were clearly shifted to the noble direction by HPT, leading to an improvement in pitting corrosion resistance. This improvement was larger in the Al-0.5%Fe and Al-2%Fe alloys and smaller in the Al-5%Fe alloy. The Al-Fe alloys contained precipitates of Al-Fe intermetallic compounds, around which pitting corrosion occurred. The Al-5%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 AI oxide films increases as a result of HPT. It was therefore concluded that the improvement in pitting corrosion resistance ot the Al-Fe alloys with HPT is causea by increasing the oxidation rate of Al.

Original languageEnglish
Pages (from-to)543-549
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume77
Issue number11
DOIs
Publication statusPublished - Nov 1 2013

Fingerprint

iron alloys
Iron alloys
pitting
Pitting
corrosion resistance
Torsional stress
aluminum alloys
torsion
Corrosion resistance
Aluminum alloys
corrosion
Corrosion
Precipitates
precipitates
Polarization
Surface analysis
polarization
Oxide films
Intermetallics
time dependence

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 77, No. 11, 01.11.2013, p. 543-549.

Research output: Contribution to journalArticle

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 aluminum-iron alloys. In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 2013 ; Vol. 77, No. 11. pp. 543-549.
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