Abstract
The effects of solution temperature, pH, and dissolved oxygen concentration on the electrochemical behavior of Alloy 690 in high-temperature water were investigated by electrochemical potentiodynamic polarization, and the oxide films developed on the specimens were characterized by X-ray photoelectron spectroscopy (XPS). The results revealed that in deaerated water + ETA solution decreasing the temperature and the pH of the environment improves the passivity of the oxide film on Alloy 690. The XPS analysis of the oxide film formed on Alloy 690 specimens after exposing to high-temperature water showed that the outer layer of the film consists of Ni hydroxides, Cr hydroxides, and NiFe2O4, while Cr2O3 and (Ni x , Fe1 − x ) Cr2O4 form the major part of the inner layer of the film.
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This study was supported by the Large-scale Advanced PWR Nuclear Power Plant Major Project (No. 2011ZX06002001) sponsored by the Shanghai Nuclear Engineering Research and Design Institute (SNERDI).
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Duan, Z., Arjmand, F., Zhang, L. et al. Electrochemical and XPS investigation of the corrosion behavior of Alloy 690 at high-temperature water. J Solid State Electrochem 19, 2265–2273 (2015). https://doi.org/10.1007/s10008-015-2856-1
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DOI: https://doi.org/10.1007/s10008-015-2856-1