Mechanism of corrosion protection at cut edge of Zn-11%Al-3%Mg-0.2%Si coated steel sheets

Yuki Suzuki, Shinichi Yamaguchi, Masamitsu Matsumoto, Izumi Muto

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Steel coated with zinc and zinc alloys is widely utilized for home appliances, construction, automobiles, and other applications due to its high corrosion resistance. In this work, the corrosion behavior at cut edges of Zn-11%Al-3%Mg-0.2%Si-alloy-coated steel sheets (SD) was investigated with a cyclic wet-dry corrosion test. The results showed that SD has anticorrosive property superior to that of zinc-coated steel sheets (GI) during the early period of corrosion. GI produced red rust, whereas SD produced no red rust. After the cyclic wet-dry corrosion test, zinc-containing white rust was deposited on steel substrate. In the case of SD, magnesium reached the center of the cut edge, and a larger area on the steel was covered with white rust. Polarization measurements of steel substrate on which white rust was deposited clarified that the white rust of SD reduced both the anodic and cathodic current densities of the steel substrate more than GI. In the case of SD, the galvanic current between the steel substrate with white rust and the coating layer was small compared to that in the case of GI. It is suggested that this anticorrosive property of SD is caused by magnesium-containing white rust.

本文言語English
ページ(範囲)2038-2043
ページ数6
ジャーナルIsij International
60
9
DOI
出版ステータスPublished - 2020 9月 15

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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