Micro-electrochemical investigation on the role of Mg in sacrificial corrosion protection of 55mass%Al-Zn-Mg coated steel

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Michiyasu Takahashi, Masamitsu Matsumoto, Nobuyoshi Hara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effects of Mg on the anodic dissolution behavior of the 55mass%Al-Zn coating layer were determined by in situ observation during galvanostatic polarization. The Zn-‍rich phases were observed to corrode at lower potentials than the dissolution potential region of the Al-rich matrix phases, and the dissolution duration of the Zn-rich phases was prolonged by Mg addition. Moreover, the corrosion products of the 55mass%Al-Zn-Mg coating layer were suggested to inhibit the oxygen reduction reaction on the steel substrate. The sacrificial corrosion protection mechanisms due to the addition of Mg to the 55mass%Al-‍Zn coating layer were discussed.

Original languageEnglish
Pages (from-to)126-135
Number of pages10
JournalCorrosion Science
Volume129
DOIs
Publication statusPublished - 2017 Dec

Keywords

  • A. Magnesium
  • A. Metal coatings
  • A. Zinc
  • B. Galvanostatic
  • B. Polarization
  • C. Anodic dissolution

ASJC Scopus subject areas

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

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