The relation between Mn additions, microstructure and corrosion behavior of new wrought Mg-5Al alloys

Polina Metalnikov, Guy Ben-Hamu, Yael Templeman, Kwang Seon Shin, Louisa Meshi

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Three wrought Mg-5Al alloys with different Mn contents (0.5, 1.4, and 3.1 wt%) were examined and compared with a reference wrought Mg-5Al alloy. Additions of Mn decreased the grain size and caused precipitation of various Al-Mn intermetallide with different Al/Mn ratio. The corrosion resistance of the Mn-containing alloys significantly increased in comparison to the reference alloy. This contributed to a reduced harmful effect of the impurities, refined microstructure and formation of corrosion products layer. However, further increasing of Mn content caused greater precipitation of the Al-Mn intermetallics, which in its turn increased the galvanic micro-coupling. The alloy with 3.1 wt% Mn additions formed a relatively protective oxide film, which balances the increased number of cathodic particles, and its corrosion rate was very close to that of alloy with 1.4 wt% Mn content.

Original languageEnglish
Pages (from-to)101-115
Number of pages15
JournalMaterials Characterization
Volume145
DOIs
StatePublished - 1 Nov 2018

Keywords

  • Corrosion resistance
  • Magnesium alloys
  • Microstructure
  • Mn content
  • SKPFM

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