Journal
CORROSION SCIENCE
Volume 156, Issue -, Pages 117-124Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.05.017
Keywords
Cr coatings; High temperature steam oxidation; Reduction of Cr2O3
Funding
- China National Science and Technology Major Special Project Research on Accident Tolerant Fuels Key Technologies [2015ZX06004-001]
- National Natural Science Foundation of China [91326102, 51532009]
- Science and Technology Development Foundation of China Academy of Engineering Physics [2013A0301012]
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Cr coatings deposited on zircaloy-4 substrates have been oxidized in high temperature steam environment from 1000 degrees C to 1200 degrees C in this study. It has been reported by many authors that Cr coatings have exhibited excellent oxidation resistance in steam environment because of the formation of a dense and adherent Cr2O3 layer on the surface. However, we have found that in the stage when the Cr coating has completely been oxidized and approached the coating-substrate interface, it is reduced by the Zr substrate and mostly transformed into a metallic Cr layer. The mechanisms of oxidation in this stage is therefore more interesting than generally assumed and we have proposed a new model based on the diffusion and redox reaction between Zr and Cr layers in high temperature steam environment.
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