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01365 CORROSION BEHAVIOR OF CONSTITUENT METALS OF STAINLESS ALLOYS IN SCWO ENVIRONMENTS

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Product Number: 51300-01365-SG
ISBN: 01365 2001 CP
Author: N. Hara, S. Tanaka and K. Sugimoto
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The corrosion behavior of pure Fe, Ni, Cr, Mo, and Ti has been examined in pure water and lmM-HCl solutions at 500°C and 29.4MPa. In pure water, these metals oxidized and their oxidation rates were in the following order: Fe>Ni>Ti>Mo>>Cr. The oxidation kinetics of Fe, Ni and Ti obeyed the parabolic rate law. After corrosion tests in pure water, the metals were covered with adherent oxide films of Fe3O4, NiO, Cr2O3, MoO2, and TiO2 (rutile), respectively. Except for Ni, oxidation was a dominant corrosion process in deaerated lmM-HCl. When exposed to this solution for short times (<30h), Ni yielded a weight loss. Pure Fe had approximately the same oxidation rate as in pure water. The oxidation rates of Cr, Mo and Ti in deaerated lmM-HCI were higher than those observed in pure water, while the oxide films formed on the metals had essentially the same composition as those in pure water. The addition of H2O2 to HCl solutions accelerated the corrosion of Fe, Ni, Cr, and Mo. The corrosion rate of Fe in lmM HCI + 0.6M H2O2 was approximately three times higher than that in deaerated lmM-HCI. In the oxidizing HCl solution, Ni showed the largest weight gain among the five metals examined, and Cr and Mo suffered from general corrosion, probably due to transpassive dissolution. Keywords: supercritical water oxidation, pure water, hydrochloric acid, hydrogen peroxide, iron, nickel, chromium, molybdenum, titanium, oxidation, dissolution, pitting corrosion, transpassive dissolution.
The corrosion behavior of pure Fe, Ni, Cr, Mo, and Ti has been examined in pure water and lmM-HCl solutions at 500°C and 29.4MPa. In pure water, these metals oxidized and their oxidation rates were in the following order: Fe>Ni>Ti>Mo>>Cr. The oxidation kinetics of Fe, Ni and Ti obeyed the parabolic rate law. After corrosion tests in pure water, the metals were covered with adherent oxide films of Fe3O4, NiO, Cr2O3, MoO2, and TiO2 (rutile), respectively. Except for Ni, oxidation was a dominant corrosion process in deaerated lmM-HCl. When exposed to this solution for short times (<30h), Ni yielded a weight loss. Pure Fe had approximately the same oxidation rate as in pure water. The oxidation rates of Cr, Mo and Ti in deaerated lmM-HCI were higher than those observed in pure water, while the oxide films formed on the metals had essentially the same composition as those in pure water. The addition of H2O2 to HCl solutions accelerated the corrosion of Fe, Ni, Cr, and Mo. The corrosion rate of Fe in lmM HCI + 0.6M H2O2 was approximately three times higher than that in deaerated lmM-HCI. In the oxidizing HCl solution, Ni showed the largest weight gain among the five metals examined, and Cr and Mo suffered from general corrosion, probably due to transpassive dissolution. Keywords: supercritical water oxidation, pure water, hydrochloric acid, hydrogen peroxide, iron, nickel, chromium, molybdenum, titanium, oxidation, dissolution, pitting corrosion, transpassive dissolution.
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