Electrodeposition of aluminum (Al) on magnesium (Mg) alloy in ionic liquid

W. T. Tsai, I. W. Sun

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

To improve the corrosion resistance of magnesium (Mg) alloys, surface modification is applied in an attempt to produce a corrosion resistant barrier. In this chapter, a new method to deposit aluminum (Al) film on an Mg alloy surface is demonstrated. Electrodeposition of A1 on AZ91D Mg alloy, using an acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride ionic liquid (AlCl3-EMIC), has been shown to be feasible. The existence of Al coating can cause a substantial increase in corrosion resistance, reducing the susceptibility of Mg alloy to aqueous corrosion. The results of electrochemical impedance spectroscopy show that Al coating leads to an increase in the polarization resistance of a bare Mg alloy by one order of magnitude in 3.5wt% NaCl solution. Furthermore, the potentiodynamic polarization results show that Al-coated Mg alloy can be passivated, and a wider passive region with a lower passive current density can be obtained if the Al is electrodeposited at a lower applied current or a low cathodic overpotential. The passivity of the co-deposited Al/Zn film is slightly inferior to that of the pure Al coating.

Original languageEnglish
Title of host publicationCorrosion of Magnesium Alloys
PublisherElsevier Inc.
Pages519-540
Number of pages22
ISBN (Print)9781845697082
DOIs
Publication statusPublished - 2011 Mar

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Magnesium alloys
Ionic liquids
Electrodeposition
Aluminum coatings
Aluminum
Corrosion resistance
Bauxite deposits
Corrosion
Aluminum chloride
Potentiodynamic polarization
Electrochemical impedance spectroscopy
Surface treatment
Current density
Polarization

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Tsai, W. T. ; Sun, I. W. / Electrodeposition of aluminum (Al) on magnesium (Mg) alloy in ionic liquid. Corrosion of Magnesium Alloys. Elsevier Inc., 2011. pp. 519-540
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Electrodeposition of aluminum (Al) on magnesium (Mg) alloy in ionic liquid. / Tsai, W. T.; Sun, I. W.

Corrosion of Magnesium Alloys. Elsevier Inc., 2011. p. 519-540.

Research output: Chapter in Book/Report/Conference proceedingChapter

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