Corrosion of Steel in Anaerobic Seawater

DOI Web Site 13 References
  • Ito Daisuke
    Graduate School of Engineering, Yokohama National University
  • Nagai Takaaki
    Faculty of Engineering, Yokohama National University（Now at Ven ture Academia Co.Ltd.）
  • Asakura Shukuji
    Faculty of Engineering, Yokohama National University

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Other Title
  • <b>嫌気性海水中における鋼の腐食性の</b><b>検討 </b>
  • 嫌気性海水中における鋼の腐食性の検討
  • ケンキセイ カイスイチュウ ニ オケル コウ ノ フショクセイ ノ ケントウ

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<p>The corrosion of steel in anaerobic seawater was examined using a 30 m3 steel tank. The water temperature in the tank was able to imitate the seasonal changes of natural seawater. The sulfides concentration in seawater within the tank was confirmed to change corresponding to seasons in which the maximum concentration was 1.38 mg・L ─1 . Immersion tests for 10 days showed that the corrosion rate increased with increasing concentration of sulfide up to 1 mg・L ─1 , and decreased rapidly in higher concentration than 1 mg・L ─1 . This relation corresponded to the formation of the iron sulfide film. By continuous immersion tests, the corrosion rate was found to decrease with immersion time. However, the depth of the pit was 0.034 mm after 211 days. The rate of pitting corrosion was estimated to be 0.058 mm・y ─1 , indicating that the corrosion rate is high even in an anaerobic environment. These results indicated that the corrosion behavior can not be understood based on the re sult of time tests. </p>

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