沖縄における構造用材料の大気腐食と腐食環境評価

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タイトル別名
  • Corrosive Environment and Evaluation Atmospheric Corrosion of Structural Materials in Okinawa
  • オキナワ ニ オケル コウゾウ ヨウザイリョウ ノ タイキ フショク ト フショク カンキョウ ヒョウカ

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抄録

Atmospheric corrosion progresses with wetting and drying steps under a very thin film of water. The relative humidity and amount of attached sea salt influence the formation of a thin water film in particular. Thermodynamic calculations of the water film's composition and thickness showed that the thickness of the water film increases rapidly at a relative humidity of 76% RH. The amount of attached sea salt is 1 g/m2 and the water film thickness is approximately 30 μm. In Okinawa, the corrosion environment deteriorates more severely due the increase in sea salt caused by typhoons as well as the high temperatures and humidity. In areas where the amount of rainfall is miniscule, the amount of sea salt tends to be cumulatively enhanced; however, in environments that receive a large amount of rain, this tendency is lessened due to cleaning. An ACM sensor comprised of a Fe-Ag pair is effective for the evaluation of corrosion environments.

収録刊行物

  • 表面科学

    表面科学 36 (1), 35-40, 2015

    公益社団法人 日本表面科学会

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