Formation and breakdown of surface films on magnesium and its alloys in aqueous solutions

Nobuyoshi Hara, Yasuhiro Kobayashi, Daisuke Kagaya, Noboru Akao

Research output: Contribution to journalArticlepeer-review

169 Citations (Scopus)

Abstract

The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)2 grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na2SO4 solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed.

Original languageEnglish
Pages (from-to)166-175
Number of pages10
JournalCorrosion Science
Volume49
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

Keywords

  • A. Magnesium
  • A. Mg alloys
  • B. Ellipsometry
  • C. Film thickness
  • C. Oxidation films

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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