The corrosion performance of die-cast magnesium alloy MRI230D in 3.5% NaCl solution saturated with Mg(OH)2

E. Aghion, N. Lulu

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The environmental behavior of die-cast magnesium alloy MRI230D designated for high-temperature applications was evaluated in comparison with regular AZ91D alloy. The microstructure examination was carried out using SEM, TEM, and X-ray diffraction analysis; the corrosion performance in 3.5% NaCl solution was evaluated by immersion test, salt spray testing, potentiodynamic polarization analysis, and stress corrosion behavior by Slow Strain Rate Testing (SSRT). Although the general corrosion resistance of MRI230D was slightly improved compared to that of AZ91D alloy its stress corrosion resistance was relatively reduced. The variations in the environmental behavior of the two alloys were mainly due to the differences in their chemical composition and microstructure after die casting. In particular, the differences were related to the reduced Al content in MRI230D and the addition of Ca to this alloy, which consequently affected its relative microstructure and electrochemical characteristics.

Original languageEnglish
Pages (from-to)1221-1226
Number of pages6
JournalMaterials Characterization
Volume61
Issue number11
DOIs
StatePublished - 1 Nov 2010

Keywords

  • Corrosion
  • Die-cast magnesium alloys
  • MRI230D
  • Stress corrosion

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