Corrosion and electrochemical properties of Sn-8% Zn alloy-coated steel in methanol containing H2O, NaCl, and HCOOH

Rie Umebayashi, Noboru Akao, Nobuyoshi Hara, Katsuhisa Sugimoto

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Corrosion and electrochemical properties of Sn-8% Zn alloy-coated steel prepared by a melt-dipping method have been investigated in methanol containing H2O, NaCl, and HCOOH, which are known as contaminants in methanol fuel. The coated steel showed high corrosion resistance in methanol containing 0.1-30% H2O and 0.1-30% H2O + 0.1% NaCl. However, the coated steel showed slight corrosion in methanol containing 0.1-30% H2O + 0.1% HCOOH. Polarization curves measured in methanol containing 0.1-30% H2O + 0.1% NaCl showed that the corrosion potential of the coated steel was close to that of Zn, while the pitting potential of the coated steel was closed to that of Sn. Polarization curves of the coated steel measured in methanol containing 0.1-30% H2O + 0.1% HCOOH showed that both anodic and cathodic currents monotonously increased from corrosion potentials. This behavior was very similar to that of Zn. According to Auger electron spectroscopy and X-ray photoelectron spectroscopy analyses, the surface film of the coated steel after an immersion corrosion test in methanol containing 0.1% H2O + 0.1% NaCl was composed of a large amount of oxide and hydroxide of Zn and a small amount of those of Sn. It was presumed that the corrosion of the coated steel in methanol containing H2O, NaCl, and HCOOH proceeded through the selective dissolution of the Zn component in the coating layer.

本文言語English
ページ(範囲)B295-B302
ジャーナルJournal of the Electrochemical Society
150
7
DOI
出版ステータスPublished - 2003 7月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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