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The Consideration of re-oxidation behavior of metal ions in high concentration nitrate solution by thermodynamic model of nitric acid

Kato, Chiaki   ; Motooka, Takafumi; Yamamoto, Masahiro 

It is reported that high concentration NO$$_{3}$$$$^{-}$$ ion accelerated corrosion of stainless steel in nitric acid solutions including the high concentration nitrate due to reoxidation of oxidizability ions such as Cr(VI). The valence state of oxidizability ions in a boiling nitric acid aqueous solution was calculated quantitatively by developed thermodynamics model of boiling nitric acid solutions and comparison with the measured value and calculated value was conducted. As the applications of the thermodynamics model, the influence of the NO$$_{3}$$$$^{-}$$ concentration in high concentration nitrate solutions accelerated re-oxidation of oxidizability ions such as Cr(VI) was investigated. As a result, optimized thermodynamics model of boiling nitric acid solutions is able to calculate REDOX potential of nitric acid solution and evaluate quantitatively the valence state of oxidizability ions in a boiling nitric acid aqueous solution.

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