Oxidation behavior, thermal stability, and the coating/substrate interface evolution of CrN-coated Zircaloy under high-temperature steam

[Display omitted] •A dense CrN layer with excellent oxidation resistance was deposited on Zircaloy.•The steam oxidation mechanism of CrN coating at 1000 ℃ and 1200 ℃ was discussed.•The internal oxidation of Zr inside the nitride coating was observed.•The nitrogen diffusion behaviors in CrN coating a...

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Bibliographic Details
Published in:Corrosion science 2021-06, Vol.185, p.109416, Article 109416
Main Authors: Liu, Junkai, Hao, Zhe, Cui, Zhexin, Ma, Dayan, Lu, Junqiang, Cui, Yanguang, Li, Chong, Liu, Wenbo, Xie, Shijing, Hu, Pengfei, Huang, Ping, Bai, Guanghai, Yun, Di
Format: Article
Language:English
Subjects:
Cathodic coating (process)
Chromium nitride
CrN coating
Diffusion coatings
Diffusion layers
High temperature
Interface stability
Interfaces
Internal oxidation
Ion plating
Multilayers
Oxidation
Oxidation resistance
Reactor conditions
Spallation
Substrates
TEM
Thermal stability
Zircaloys (trademark)
Zirconium
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Summary:[Display omitted] •A dense CrN layer with excellent oxidation resistance was deposited on Zircaloy.•The steam oxidation mechanism of CrN coating at 1000 ℃ and 1200 ℃ was discussed.•The internal oxidation of Zr inside the nitride coating was observed.•The nitrogen diffusion behaviors in CrN coating at high temperature were studied.•A ZrN nano-twins layer formed at the coating/substrate interface after oxidation. CrN-coated Zircaloy samples were prepared by cathodic arc ion plating, and the microstructure, stability, and oxidation behaviors of the CrN coatings in high-temperature steams were comprehensively investigated. The CrN coating significantly increased the oxidation resistance of Zircaloy exposed to steam through the formation of a dense Cr2O3 oxide layer without cracking or spallation. Two different multi-layered coatings were produced after the steam exposures. The nitrogen diffusion properties of the CrN coatings during oxidation were examined. The internal oxidation of Zr particles inside the nitride coating was observed. A ZrN nano-twinned layer formed at the coating/substrate interface.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109416