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Tsukada, Takashi; Kita, Satoshi; Ueno, Fumiyoshi
no journal, ,
Corrosion behavior of steel materials such as mild steel or low alloy steel in water environment has been examined by corrosion tests immersing specimens statically to test solution. However, in the actual plant environment, conditions of water flow or alternating exposure to water/air are dynamically affecting the corrosion behavior. In this study, therefore, corrosion tests by rotating flat-type specimens in the diluted seawater/air environment were performed and effects of water flow and alternating exposure on corrosion of the steels were examined. Results of the rotating corrosion tests in 200 times diluted seawater saturated with dissolved oxygen at 30
C for 500 hours will be presented and discussed in the presentation.
Tsukada, Takashi; Terakado, Hiroshi; Ebata, Koei; Ueno, Fumiyoshi
no journal, ,
At the Fukushima Daiichi Nuclear Power Plant, nitrogen gas has been injected into the primary containment vessel, PCV to prevent the hydrogen explosion and corrosion of steel materials. It is considered that the oxygen concentration in the nitrogen environment varies in PCV and the inner surface of PCV is exposed to water and gas environment alternately near the water surface position. In this study, therefore, corrosion tests by rotating flat-type specimens in diluted seawater/nitrogen environment with oxygen concentrations of 0%, 1% and 5% were performed to study corrosion behavior of the steel material. Results of the tests at 303 K for 500 hours are discussed from a viewpoint of the effects of oxygen concentration and rotating speed.