Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 883, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160798
Keywords
ZrO2/Cr composite coating; Pure zirconium; High-temperature steam oxidation; Hydrogen pickup
Categories
Funding
- Innovation Center of National Defence Industry [ICNM2020YZ04]
- National Natural Science Foundation of China [51671032]
- Beijing Municipal Natural Science Foundation [2172029]
- BJAST-RD Funds [PY2020GJ26]
- Fundamental Research Funds for the Central Universities [2019NTS05]
- Sharing Service Platform of CAS Large Research Infrastructures [2021HIRFLZD001823]
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In this study, ZrO2/Cr composite coatings were fabricated on pure zirconium using PEO and FCVAD techniques, showing significantly improved steam oxidation resistance for zirconium materials.
Plasma electrolytic oxidation (PEO) and filtered cathodic vacuum arc deposition (FCVAD) techniques were employed to fabricate a ZrO2/Cr composite coating on pure zirconium. The steam oxidation properties of bare and ZrO2/Cr-coated pure Zr were performed in water vapor environment at 900-1100 degrees C. Their morphologies, microstructures and phase constituents before and after steam oxidation were analyzed. Meanwhile, their composition depth profiles were measured by glow discharge optical emission spectroscopy (GDOES). It was found that the mass gain of ZrO2/Cr-coated Zr was about 22-45% of that of bare Zr after 3600 s steam oxidation at 900-1100 degrees C, and the PEO and FCVAD composite treatments significantly improved the steam oxidation resistance of Zr. After steam oxidation, the phosphorous element in the outer layer of PEO film from phosphate electrolyte diffused into the residual Cr layer, however, most of the phosphorous in the interior of PEO layer was remained although the phosphorus diffusion in the region was accelerated with the increase of steam temperature. The ZrO2 to Zr3O phase transformation in PEO intermediate layer occurred in high temperature steam. Furthermore, the PEO zirconia interlayer suppressed hydrogen permeation into the Zr substrate during steam oxidation at 900-1100 degrees C. (C) 2021 Elsevier B.V. All rights reserved.
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