Improved corrosion resistance of magnesium alloy with a surface aluminum coating electrodeposited in ionic liquid

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

Research output: Contribution to journalArticle

48 Citations (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 (AlCl3 -EMIC) ionic liquid under a galvanostatic condition at room temperature. Effects of deposition current density 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 Al coating was evaluated by electrochemical measurements and a salt spray test. The electrochemical impedance spectroscopic data indicated that a bare Mg alloy had a polarization resistance of only 470 cm2 in 3.5 wt % NaCl solution, whereas the Al-coated Mg sample showed its resistance as high as 8700 cm2 in the same environment. Moreover, it was also found that the Al layer deposited at a lower current density was more compact and uniform when compared to that deposited at a higher current density; consequently, this coating revealed a superior protection capability for the Mg substrate against corrosion.

Original languageEnglish
Pages (from-to)C112-C116
JournalJournal of the Electrochemical Society
Volume155
Issue number3
DOIs
Publication statusPublished - 2008 Jan 29

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Aluminum coatings
aluminum coatings
Ionic Liquids
magnesium alloys
Magnesium alloys
Aluminum
Ionic liquids
corrosion resistance
Corrosion resistance
Current density
current density
aluminum
Magnesium
magnesium
liquids
salt spray tests
aluminum chlorides
Aluminum chloride
Diffractometers
low currents

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Chang, Jeng Kuei ; Chen, Su Yau ; Tsai, Wen Ta ; Deng, Ming Jay ; Sun, I. Wen. / Improved corrosion resistance of magnesium alloy with a surface aluminum coating electrodeposited in ionic liquid. In: Journal of the Electrochemical Society. 2008 ; Vol. 155, No. 3. pp. C112-C116.
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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 (AlCl3 -EMIC) ionic liquid under a galvanostatic condition at room temperature. Effects of deposition current density 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 Al coating was evaluated by electrochemical measurements and a salt spray test. The electrochemical impedance spectroscopic data indicated that a bare Mg alloy had a polarization resistance of only 470 cm2 in 3.5 wt {\%} NaCl solution, whereas the Al-coated Mg sample showed its resistance as high as 8700 cm2 in the same environment. Moreover, it was also found that the Al layer deposited at a lower current density was more compact and uniform when compared to that deposited at a higher current density; consequently, this coating revealed a superior protection capability for the Mg substrate against corrosion.",
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Improved corrosion resistance of magnesium alloy with a surface aluminum coating electrodeposited in ionic liquid. / Chang, Jeng Kuei; Chen, Su Yau; Tsai, Wen Ta; Deng, Ming Jay; Sun, I. Wen.

In: Journal of the Electrochemical Society, Vol. 155, No. 3, 29.01.2008, p. C112-C116.

Research output: Contribution to journalArticle

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AU - Sun, I. Wen

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