Role of Sn in microstructure and corrosion behavior of new wrought Mg-5Al alloy

Polina Metalnikov, Guy Ben-Hamu, Dan Eliezer, Kwang Seon Shin

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The effect of Sn additions on the microstructure and corrosion behavior of new wrought Mg-5Al-xSn (x = 0.71, 1.47, 2.44, and 3.09 wt%) was studied through optical and electron microscopy, XRD, hydrogen evolution test, and electrochemical measurements. Increasing of the Sn content was followed an increase in the quantity of Sn dissolved in the Mg matrix and precipitation of Mg2Sn intermetallics when Sn content exceeded 1.47 wt%. The corrosion mode in a short immersion period was pitting corrosion; presence of cathodic sites (i.e., Mg2Sn intermetallics) deteriorated the alloys' corrosion resistance. However, with a long immersion period the corrosion mode of the alloys with Sn content above 0.71 wt% was mixed pitting and filiform corrosion, indicating that a passivation layer was formed on the alloys' surface and increased their corrosion resistance.

Original languageEnglish
Pages (from-to)835-849
Number of pages15
JournalJournal of Alloys and Compounds
Volume777
DOIs
StatePublished - 10 Mar 2019

Keywords

  • Electrochemical impedance spectroscopy
  • Filiform corrosion
  • Magnesium alloy
  • Microstructure
  • SEM
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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