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※ 半角英数字
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気液交番環境における鋼の腐食挙動に及ぼす人工海水濃度の影響

Effect of concentration of artificial sea water on corrosion behavior of steel in air-solution alternating condition

大谷 恭平  ; 塚田 隆 ; 上野 文義  ; 加藤 千明  

Otani, Kyohei; Tsukada, Takashi; Ueno, Fumiyoshi; Kato, Chiaki

既報では福島第一原子力発電所の格納容器内部を模擬した大気と液中に交互に曝露する気液交番環境で炭素鋼の腐食試験を行い、交番曝露により鋼の腐食速度が加速することを報告した。本発表では、気液交番環境における鋼の腐食挙動におよぼす人工海水濃度の影響について調査した。腐食速度の測定より、気液交番環境における炭素鋼の腐食速度は希釈倍率200倍のときに最大となることを見出した。更に、腐食後の鋼に形成した鉄さび層の断面分析より、人工海水中の金属カチオンの析出により炭素鋼の腐食速度が低下することを明らかにした。

Corrosion tests of carbon steel was carried out in air-solution alternating condition in previous study. It has been reported that the corrosion rate of carbon steel exposed in air-solution alternating condition was accelerated compare with the steel exposed in solution. In this study, it was investigated that the effect of concentration of model sea water on corrosion rate of carbon steel in air-solution alternating condition. The mass measurement in corrosion tests clarified that the corrosion rate of carbon steel in the 200 times diluted model sea water is fastest during various model sea water. Cross-sectional analysis of iron rust layer formed on carbon steel after corrosion tests indicated that the corrosion rate of carbon steel in model sea water is decreased by precipitation of metal cations containing in model sea water.

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