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- W3169461926 abstract "The corrosion rate of a metal depends on the nature of the surface oxide and its redox environment. Ionizing radiation can significantly alter the redox environment in water. We have investigated the impact of γ-radiation on the kinetics of carbon steel corrosion by characterizing the oxide films formed on carbon steel as a function of pH, cover gas, temperature, and irradiation time, using a range of surface analysis techniques. Results show that continuous irradiation enhances surface oxide formation with the type of oxide depending on the solution pH. For tests at 150{sup o}C and a [OH{sup -}] equivalent to that for pH{sub 25°C} = 10.6, the surface oxide on carbon steel after γ-irradiation was non-porous and uniform; no localized corrosion was observed. However, this oxide appears to be susceptible to brittle fracture during cooling. Raman spectroscopy of the surface film shows that it is a mixed phase of Fe{sub 3}O{sub 4} and γ-Fe{sub 2}O{sub 3}. In contrast, for tests at 150{sup o}C with [OH{sup -}] equivalent to neutral pH{sub 25°C}, metal dissolution is significant and the surface oxide film is very porous. While Raman spectra show an oxide mostly composed of a similar mixed phase of Fe{sub 3}O{sub 4} and γ-Fe{sub 2}O{sub 3}, SEM micrographs provide an image of the porous nature of the oxide grown at neutral pH{sub 25°C}. At both pHs, α-Fe{sub 2}O{sub 3} phase oxide, the most thermodynamically stable oxide under oxidizing conditions, has not been observed. The combination of this study and previously reported electrochemical studies provide a clearer understanding of the temperature dependence of oxide film formation/conversion processes on carbon steel, and allows us to distinguish radiation effects from those of temperature. (author)" @default.
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- W3169461926 date "2010-07-01" @default.
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- W3169461926 title "Surface analysis study of gamma-radiation-induced carbon steel corrosion" @default.
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