Material Characteristics and Corrosion Performance of Heat-Treated AI-Zn Coatings Electrodeposited on AZ91D Magnesium Alloy from an Ionic Liquid

Szu Jung Pan, Wen-Ta Tsai, Jui-Chao Kuo, I-Wen Sun

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This study examined co-deposition of Al and Zn on active AZ91D magnesium alloy using ionic liquid electrodeposition. A room temperature Lewis acidic ionic liquid made of aluminum chloride (AlCl3) and 1-ethyl-3-methylimidazolium chloride (EMIC) with a mole ratio of 60:40 was used as the bath for pure Al electrodeposition, while the addition of 1 wt% ZnCl2 to this electrolyte was used for co-deposition of Al-Zn on AZ91D magnesium alloy. The material characteristics and corrosion performance of the as-deposited films formed under various deposition charges and those annealed at 200 and 300°C were investigated. The experimental results showed that both pure Al and Al-Zn coatings provided adequate passivity for the AZ91D magnesium alloy. The re-distribution of the chemical composition after heat-treatment, including the formation of intermetallic compounds, gave rise to an increased microhardness and improved passivation behavior of the Al-Zn coated AZ91D magnesium alloy.

Original languageEnglish
Pages (from-to)D320-D325
JournalJournal of the Electrochemical Society
Volume160
Issue number8
DOIs
Publication statusPublished - 2013 Jan 1

All Science Journal Classification (ASJC) codes

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

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