Effect of W on corrosion behavior of low alloy steel in wet/dry environment

Toshiyasu Nishimura, Kazuhiko Noda, Toshiaki Kodama

研究成果: Article

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The chemical state of the tungsten (W) in the rust of low alloy steel was analyzed by EPMA and XPS, and the electrochemical behavior of rust was investigated by alternating current (AC) impedance method after wet/dry cyclic corrosion test with chlorides. The 1.0 mass%W- bearing steel showed higher corrosion resistance than carbon steel in the corrosion test. EPMA and XPS showed that the tungsten existed as WO4 compounds in the rust of W-bearing steel. A Fe-W binary potential-pH diagram was made to investigate the thermodynamic stability of Fe-W oxides, and this showed that WO4 was stable in the rust, which confirmed the physical analysis. An AC impedance measurement was made to obtain the corrosion reaction resistance (Rt) of the rust, and it was found that Rt of W-bearing steel was much larger than that of carbon steel. The corrosion of the W-bearing steel is suppressed by (1) the insoluble FeWO4 formed near the base metal suppressing the anodic reaction, (2) the WO42- ions in the rust changing the selective permeability to prevent the transport of Cl- ions.

元の言語English
ページ(範囲)734-738
ページ数5
ジャーナルZairyo to Kankyo/ Corrosion Engineering
49
発行部数12
DOI
出版物ステータスPublished - 2000 1 1
外部発表Yes

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrochemistry
  • Materials Chemistry

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