An interesting oxidation phenomenon of Cr coatings on Zry-4 substrates in high temperature steam environment
By Xiaochun Han, Jiaxiang Xue, S. Peng, Haibin Zhang. Corrosion Science, 2019
166 citations recorded by the source corpus.
Abstract Cr coatings deposited on zircaloy-4 substrates have been oxidized in high temperature steam environment from 1000 °C to 1200 °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.
Subfields: Aerospace Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/3c199a60fc027ecbc2ea1771075acc5ba552be6f
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In Aerospace Engineering
In Materials Chemistry
Citations in the corpus
- Oxidation kinetics of Cr-coated zirconium alloy: Effect of coating thickness and microstructure (2020, background): “In this process Zr atoms can transfer electrons to Cr2O3 reducing Cr ions to neutral atoms and the free oxygen ions can diffuse and react with Zr to form ZrO2 phase [10,35].”