Improved corrosion resistance of Mg alloy by surface AI electrodeposition

Jeng Kuei Chang, Su Yau Chen, Wen Ta Tsai, Ming Jay Deng, I. Wen Sun

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

A metallic aluminum (Al) layer was successfully electrodeposited onto a magnesium (Mg) alloy in a Lewis acidic aluminum chloride-1-ethyl-3- methylimidazolium chloride (AICI3-EMIC) ionic liquid under a potentiostatic condition at room temperature. Effects of the deposition potential on material characteristics of the deposited layers were explored by means of a scanning electron microscope and an X-ray diffractometer. In addition, the improvement in corrosion resistance of the Mg alloy due to the AI coating was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The electrochemical impedance spectroscopic data indicated that a bare Mg alloy had a polarization resistance of only 500 Ω-cm2 in 3.5 wt% NaCl solution while the Al-coated Mg sample showed its resistance as high as 5000 Ω-cm2 in the same environment. Moreover, it was also found that the AI layer deposited at a lower overpotential was more compact and uniform (as compared with that deposited at a higher overpotential); consequently, this coating revealed a superior protection capability for the Mg substrate against corrosion.

Original languageEnglish
Pages (from-to)82091-820911
Number of pages738821
JournalNACE - International Corrosion Conference Series
Publication statusPublished - 2008 Dec 1
EventCorrosion 2008 - New Orleans, LO, United States
Duration: 2008 Mar 162008 Mar 20

Fingerprint

Magnesium alloys
Electrodeposition
Corrosion resistance
Aluminum
Magnesium
Aluminum chloride
Ionic Liquids
Coatings
Potentiodynamic polarization
Diffractometers
Electrochemical impedance spectroscopy
Ionic liquids
Chlorides
Electron microscopes
Polarization
Corrosion
Scanning
X rays
Substrates
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

Cite this

Chang, Jeng Kuei ; Chen, Su Yau ; Tsai, Wen Ta ; Deng, Ming Jay ; Sun, I. Wen. / Improved corrosion resistance of Mg alloy by surface AI electrodeposition. In: NACE - International Corrosion Conference Series. 2008 ; pp. 82091-820911.
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abstract = "A metallic aluminum (Al) layer was successfully electrodeposited onto a magnesium (Mg) alloy in a Lewis acidic aluminum chloride-1-ethyl-3- methylimidazolium chloride (AICI3-EMIC) ionic liquid under a potentiostatic condition at room temperature. Effects of the deposition potential on material characteristics of the deposited layers were explored by means of a scanning electron microscope and an X-ray diffractometer. In addition, the improvement in corrosion resistance of the Mg alloy due to the AI coating was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The electrochemical impedance spectroscopic data indicated that a bare Mg alloy had a polarization resistance of only 500 Ω-cm2 in 3.5 wt{\%} NaCl solution while the Al-coated Mg sample showed its resistance as high as 5000 Ω-cm2 in the same environment. Moreover, it was also found that the AI layer deposited at a lower overpotential was more compact and uniform (as compared with that deposited at a higher overpotential); consequently, this coating revealed a superior protection capability for the Mg substrate against corrosion.",
author = "Chang, {Jeng Kuei} and Chen, {Su Yau} and Tsai, {Wen Ta} and Deng, {Ming Jay} and Sun, {I. Wen}",
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Improved corrosion resistance of Mg alloy by surface AI electrodeposition. / Chang, Jeng Kuei; Chen, Su Yau; Tsai, Wen Ta; Deng, Ming Jay; Sun, I. Wen.

In: NACE - International Corrosion Conference Series, 01.12.2008, p. 82091-820911.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Improved corrosion resistance of Mg alloy by surface AI electrodeposition

AU - Chang, Jeng Kuei

AU - Chen, Su Yau

AU - Tsai, Wen Ta

AU - Deng, Ming Jay

AU - Sun, I. Wen

PY - 2008/12/1

Y1 - 2008/12/1

N2 - A metallic aluminum (Al) layer was successfully electrodeposited onto a magnesium (Mg) alloy in a Lewis acidic aluminum chloride-1-ethyl-3- methylimidazolium chloride (AICI3-EMIC) ionic liquid under a potentiostatic condition at room temperature. Effects of the deposition potential on material characteristics of the deposited layers were explored by means of a scanning electron microscope and an X-ray diffractometer. In addition, the improvement in corrosion resistance of the Mg alloy due to the AI coating was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The electrochemical impedance spectroscopic data indicated that a bare Mg alloy had a polarization resistance of only 500 Ω-cm2 in 3.5 wt% NaCl solution while the Al-coated Mg sample showed its resistance as high as 5000 Ω-cm2 in the same environment. Moreover, it was also found that the AI layer deposited at a lower overpotential was more compact and uniform (as compared with that deposited at a higher overpotential); consequently, this coating revealed a superior protection capability for the Mg substrate against corrosion.

AB - A metallic aluminum (Al) layer was successfully electrodeposited onto a magnesium (Mg) alloy in a Lewis acidic aluminum chloride-1-ethyl-3- methylimidazolium chloride (AICI3-EMIC) ionic liquid under a potentiostatic condition at room temperature. Effects of the deposition potential on material characteristics of the deposited layers were explored by means of a scanning electron microscope and an X-ray diffractometer. In addition, the improvement in corrosion resistance of the Mg alloy due to the AI coating was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The electrochemical impedance spectroscopic data indicated that a bare Mg alloy had a polarization resistance of only 500 Ω-cm2 in 3.5 wt% NaCl solution while the Al-coated Mg sample showed its resistance as high as 5000 Ω-cm2 in the same environment. Moreover, it was also found that the AI layer deposited at a lower overpotential was more compact and uniform (as compared with that deposited at a higher overpotential); consequently, this coating revealed a superior protection capability for the Mg substrate against corrosion.

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M3 - Conference article

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