Journal
CORROSION SCIENCE
Volume 163, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108280
Keywords
Steel; Oxidation; Oxide scale; Kinetics; Point defect model; Supercritical water
Funding
- China Postdoctoral Science Foundation [2019TQ0248]
- DOE-NEUP Award of USA [DE-NE0008541]
- National Key Research and Development Program of China [2016YFC0801904]
- Fundamental Research Funds for the Central Universities [xjj2018201, xjj2018006]
- National Natural Science Foundation of China [51871179]
- China Scholarship Council (CSC)
- FUTURE (Fundamental Understanding of Transport Under Reactor Extremes), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES)
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A Point Defect Model has been developed to describe theoretically the corrosion of metals and alloys in supercritical aqueous systems. The model, SCW_PDM, accounts for the kinetics of growth of the barrier layer and the total scale thickness and for the oft-reported growth of the barrier layer with the barrier/outer layer interface remaining at the location of the original metal surface. The barrier layer grows into the metal via the production of oxygen vacancies at the metal/barrier layer interface and their annihilation at the barrier layer/outer layer interface. The proposed atomic-level rate laws for the scale growth and oxidation weight gains, not only can act as deterministic equations for extracting values of some fundamental parameters in SCW_PDM, but also can be employed to describe the oxidation kinetics of steels directly and successfully.
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