Pourbaix diagrams for the nickel-water system extended to high-subcritical and low-supercritical conditions

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• 作者：William G. Cook ; ^wcook@unb.ca ; Robert P. Olive
• 关键词：A. Nickel ; B. Electrochemical calculation ; C. High temperature corrosion ; C. Oxidation ; C. Pourbaix diagram.
• 刊名：Corrosion Science
• 出版年：2012
• 期刊代码：28_0010938x
• 类别：ch
• 出版时间：May, 2012
• 卷：58
• 期：Complete
• 页码：284-290
• 文件大小：923 K

摘要

One of the Generation IV nuclear reactor concepts is the supercriticalwater-cooled reactor (SCWR). To assist with plant design and selection of potential construction materials, Pourbaix diagrams for the nickel water-system slightly below and above the critical temperature at a pressure of 25 MPa have been developed. A revised Helgeson-Kirkham-Flowers model with parameters optimized to bunsenite solubility data was used to perform the necessary thermodynamic extrapolations. The third hydrolysis product (Ni(OH)₃^{鈭?/sup>) was included in this study after careful review of new data. The diagrams revealed the need for strict water chemistry control to prevent transitioning to regions of active corrosion.}