Influence of Zn on oxide films on Alloy 690 in borated and lithiated high temperature water |
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| Authors: | Junbo Huang Xiahe Liu En-Hou Han Xinqiang Wu |
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| Affiliation: | State Key Laboratory for Corrosion and Protection, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang 110016, PR China |
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| Abstract: | To clarify the corrosion control effect of Zn injection into hydrothermal environments, the oxide films on Alloy 690 in the deaerated borated and lithiated water have been investigated using potentiodynamic polarization curves, electrochemical impedance spectra at 300 °C and ex-situ X-ray photoelectron spectroscopy. With Zn injection in the solution, ZnCr2O4 and ZnFe2O4 were formed in the inner and outer layers of the oxide films on Alloy 690, respectively, through exchange reactions between Zn2+ and Fe2+/Ni2+. A simple model for oxide film structure change and the mechanism of corrosion inhibition by Zn injection is proposed and discussed. |
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| Keywords: | A Alloy A Zn B EIS B XPS C High temperature corrosion |
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