Pitting corrosion resistance of anodized aluminum alloy processed by severe plastic deformation

In Joon Son, Hiroaki Nakano, Satoshi Oue, Shigeo Kobayashi, Hisaaki Fukushima, Zenji Horita

研究成果: ジャーナルへの寄稿記事

8 引用 (Scopus)

抄録

The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of anodized Al and Al-Mg alloy was investigated by electrochemical techniques in a solution containing 0.25 mol/L of Alcl 3 and by surface analysis. The time required before initiating pitting corrosion of anodized Al was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. However, in anodized Al-Mg alloy, the pitting corrosion occurred earlier with ECAP than without, showing that the corrosion resistance was worse with ECAP than without. SEM and EPMA observation revealed that pitting corrosion of anodized Al occurred around the impurity precipitates and that the size of the impurity precipitate decreased as a result of the ECAP. The improvement in pitting corrosion resistance of anodized Al by ECAP appears to be attributable to a decrease in the size of impurity precipitates. On the other hand, in anodized Al-Mg alloy, cracks occurred in the anodic oxide films during initial corrosion and the cracks were larger with ECAP than without. It is assumed that the pitting corrosion was promoted by the cracks resulted from ECAP.

元の言語英語
ページ(範囲)534-540
ページ数7
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
70
発行部数7
DOI
出版物ステータス出版済み - 7 1 2006

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Equal channel angular pressing
pitting
pressing
Pitting
corrosion resistance
aluminum alloys
plastic deformation
Corrosion resistance
Aluminum alloys
Plastic deformation
corrosion
Corrosion
Precipitates
precipitates
cracks
Impurities
Cracks
impurities
Surface analysis
Electron probe microanalysis

All Science Journal Classification (ASJC) codes

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

これを引用

Pitting corrosion resistance of anodized aluminum alloy processed by severe plastic deformation. / Son, In Joon; Nakano, Hiroaki; Oue, Satoshi; Kobayashi, Shigeo; Fukushima, Hisaaki; Horita, Zenji.

:: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 巻 70, 番号 7, 01.07.2006, p. 534-540.

研究成果: ジャーナルへの寄稿記事

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abstract = "The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of anodized Al and Al-Mg alloy was investigated by electrochemical techniques in a solution containing 0.25 mol/L of Alcl 3 and by surface analysis. The time required before initiating pitting corrosion of anodized Al was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. However, in anodized Al-Mg alloy, the pitting corrosion occurred earlier with ECAP than without, showing that the corrosion resistance was worse with ECAP than without. SEM and EPMA observation revealed that pitting corrosion of anodized Al occurred around the impurity precipitates and that the size of the impurity precipitate decreased as a result of the ECAP. The improvement in pitting corrosion resistance of anodized Al by ECAP appears to be attributable to a decrease in the size of impurity precipitates. On the other hand, in anodized Al-Mg alloy, cracks occurred in the anodic oxide films during initial corrosion and the cracks were larger with ECAP than without. It is assumed that the pitting corrosion was promoted by the cracks resulted from ECAP.",
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AU - Horita, Zenji

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