Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization

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

研究成果: 著書/レポートタイプへの貢献会議での発言

1 引用 (Scopus)

抄録

The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of Al (AA1100) and Al-Mg (AA5052) alloy with anodization and without was investigated by means of polarization curves in solutions containing 300 ppm or 0.6 mol/L of Cl- and by surface analysis. In Al and Al-Mg alloy without anodization, the potentials for pitting corrosion were evidently shifted to the noble direction by ECAP process, indicating that this process improves resistance to pitting corrosion. SEM observation revealed that the pitting corrosion occurred near the impurity precipitates and the size of impurity precipitated decreased with ECAP process. The time-dependence of corrosion potential and the polarization resistance determined by AC impedance technique suggested that the formation rate of Al oxide films was increased with ECAP process. The improvement in pitting corrosion resistance of Al and Al-Mg by ECAP seems to be attributable to the decrease in the size of impurity precipitates and the increase in the formation rate of Al oxide films. On the other hand, the time required for initiating pitting corrosion of anodised Al was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. However, the pitting corrosion of anodized Al-Mg alloy occurred earlier with ECAP than without, showing that the corrosion resistance was worse with ECAP than without. 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 due to the higher internal stress resulting from ECAP.

元の言語英語
ホスト出版物のタイトルTHERMEC 2009
ページ1989-1994
ページ数6
DOI
出版物ステータス出版済み - 2 9 2010
イベント6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, ドイツ
継続期間: 8 25 20098 29 2009

出版物シリーズ

名前Materials Science Forum
638-642
ISSN(印刷物)0255-5476

その他

その他6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
ドイツ
Berlin
期間8/25/098/29/09

Fingerprint

Equal channel angular pressing
pitting
pressing
Pitting
corrosion resistance
aluminum alloys
Corrosion resistance
Aluminum alloys
corrosion
Corrosion
Oxide films
oxide films
cracks
Impurities
Cracks
impurities
Precipitates
precipitates
Polarization
Surface analysis

All Science Journal Classification (ASJC) codes

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

これを引用

Nakano, H., Son, I. J., Oue, S., Kobayashi, S., Fukushima, H., & Horita, Z. (2010). Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization. : THERMEC 2009 (pp. 1989-1994). (Materials Science Forum; 巻数 638-642). https://doi.org/10.4028/www.scientific.net/MSF.638-642.1989

Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization. / Nakano, Hiroaki; Son, In Joon; Oue, Satoshi; Kobayashi, Shigeo; Fukushima, Hisaaki; Horita, Zenji.

THERMEC 2009. 2010. p. 1989-1994 (Materials Science Forum; 巻 638-642).

研究成果: 著書/レポートタイプへの貢献会議での発言

Nakano, H, Son, IJ, Oue, S, Kobayashi, S, Fukushima, H & Horita, Z 2010, Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization. : THERMEC 2009. Materials Science Forum, 巻. 638-642, pp. 1989-1994, 6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009, Berlin, ドイツ, 8/25/09. https://doi.org/10.4028/www.scientific.net/MSF.638-642.1989
Nakano, Hiroaki ; Son, In Joon ; Oue, Satoshi ; Kobayashi, Shigeo ; Fukushima, Hisaaki ; Horita, Zenji. / Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization. THERMEC 2009. 2010. pp. 1989-1994 (Materials Science Forum).
@inproceedings{0f09ecf5d06d423a8ffba4b7ea54c263,
title = "Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization",
abstract = "The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of Al (AA1100) and Al-Mg (AA5052) alloy with anodization and without was investigated by means of polarization curves in solutions containing 300 ppm or 0.6 mol/L of Cl- and by surface analysis. In Al and Al-Mg alloy without anodization, the potentials for pitting corrosion were evidently shifted to the noble direction by ECAP process, indicating that this process improves resistance to pitting corrosion. SEM observation revealed that the pitting corrosion occurred near the impurity precipitates and the size of impurity precipitated decreased with ECAP process. The time-dependence of corrosion potential and the polarization resistance determined by AC impedance technique suggested that the formation rate of Al oxide films was increased with ECAP process. The improvement in pitting corrosion resistance of Al and Al-Mg by ECAP seems to be attributable to the decrease in the size of impurity precipitates and the increase in the formation rate of Al oxide films. On the other hand, the time required for initiating pitting corrosion of anodised Al was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. However, the pitting corrosion of anodized Al-Mg alloy occurred earlier with ECAP than without, showing that the corrosion resistance was worse with ECAP than without. 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 due to the higher internal stress resulting from ECAP.",
author = "Hiroaki Nakano and Son, {In Joon} and Satoshi Oue and Shigeo Kobayashi and Hisaaki Fukushima and Zenji Horita",
year = "2010",
month = "2",
day = "9",
doi = "10.4028/www.scientific.net/MSF.638-642.1989",
language = "English",
isbn = "0878492941",
series = "Materials Science Forum",
pages = "1989--1994",
booktitle = "THERMEC 2009",

}

TY - GEN

T1 - Effect of equal channel angular pressing on the pitting corrosion resistance on the aluminum alloys with/without anodization

AU - Nakano, Hiroaki

AU - Son, In Joon

AU - Oue, Satoshi

AU - Kobayashi, Shigeo

AU - Fukushima, Hisaaki

AU - Horita, Zenji

PY - 2010/2/9

Y1 - 2010/2/9

N2 - The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of Al (AA1100) and Al-Mg (AA5052) alloy with anodization and without was investigated by means of polarization curves in solutions containing 300 ppm or 0.6 mol/L of Cl- and by surface analysis. In Al and Al-Mg alloy without anodization, the potentials for pitting corrosion were evidently shifted to the noble direction by ECAP process, indicating that this process improves resistance to pitting corrosion. SEM observation revealed that the pitting corrosion occurred near the impurity precipitates and the size of impurity precipitated decreased with ECAP process. The time-dependence of corrosion potential and the polarization resistance determined by AC impedance technique suggested that the formation rate of Al oxide films was increased with ECAP process. The improvement in pitting corrosion resistance of Al and Al-Mg by ECAP seems to be attributable to the decrease in the size of impurity precipitates and the increase in the formation rate of Al oxide films. On the other hand, the time required for initiating pitting corrosion of anodised Al was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. However, the pitting corrosion of anodized Al-Mg alloy occurred earlier with ECAP than without, showing that the corrosion resistance was worse with ECAP than without. 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 due to the higher internal stress resulting from ECAP.

AB - The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of Al (AA1100) and Al-Mg (AA5052) alloy with anodization and without was investigated by means of polarization curves in solutions containing 300 ppm or 0.6 mol/L of Cl- and by surface analysis. In Al and Al-Mg alloy without anodization, the potentials for pitting corrosion were evidently shifted to the noble direction by ECAP process, indicating that this process improves resistance to pitting corrosion. SEM observation revealed that the pitting corrosion occurred near the impurity precipitates and the size of impurity precipitated decreased with ECAP process. The time-dependence of corrosion potential and the polarization resistance determined by AC impedance technique suggested that the formation rate of Al oxide films was increased with ECAP process. The improvement in pitting corrosion resistance of Al and Al-Mg by ECAP seems to be attributable to the decrease in the size of impurity precipitates and the increase in the formation rate of Al oxide films. On the other hand, the time required for initiating pitting corrosion of anodised Al was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. However, the pitting corrosion of anodized Al-Mg alloy occurred earlier with ECAP than without, showing that the corrosion resistance was worse with ECAP than without. 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 due to the higher internal stress resulting from ECAP.

UR - http://www.scopus.com/inward/record.url?scp=75849139315&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=75849139315&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/MSF.638-642.1989

DO - 10.4028/www.scientific.net/MSF.638-642.1989

M3 - Conference contribution

SN - 0878492941

SN - 9780878492947

T3 - Materials Science Forum

SP - 1989

EP - 1994

BT - THERMEC 2009

ER -