Transient experiments on oxidation and degradation of Cr-coated Zircaloy in steam up to 1600 ℃

Junkai Liu; Chongchong Tang; Martin Steinbrück; Jianqiao Yang; Ulrike Stegmaier; Mirco Große; Di Yun; Hans Jürgen Seifert

doi:10.1016/j.corsci.2021.109805

Transient experiments on oxidation and degradation of Cr-coated Zircaloy in steam up to 1600 ℃

Junkai Liu
, Chongchong Tang
, Martin Steinbrück
, Jianqiao Yang
, Ulrike Stegmaier
, Mirco Große
, Di Yun
, Hans Jürgen Seifert

School of Energy and Power Engineering

Research output: Contribution to journal › Article › peer-review

97 Scopus citations

Abstract

The transient oxidation behavior of magnetron-sputtered chromium-coated Zircaloy-4 was studied in steam up to 1600 °C, and the microstructural evolution of the coating-substrate system after oxidation was investigated. Coating failure and corresponding rapid oxidation of coating and substrate occurred at 1300–1400 °C. It was mainly caused by the thickness decrease of the outer dense Cr₂O₃ scale, the Zr[sbnd]Cr eutectic reaction, the Zr[sbnd]Cr interdiffusion, and the precipitation of ZrO₂ along unoxidized Cr grain boundaries. The phase transformation of tetragonal ZrO_2−x to cubic ZrO_2−y increased the oxidation rate of the Zircaloy-4 substrate at ~1500 °C through the higher oxygen diffusion coefficient in the cubic phase.

Original language	English
Article number	109805
Journal	Corrosion Science
Volume	192
DOIs	https://doi.org/10.1016/j.corsci.2021.109805
State	Published - Nov 2021

Keywords

ATF cladding
Cr coating
Failure behavior
High-temperature steam oxidation
Hydrogen release
Microstructural evolution

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10.1016/j.corsci.2021.109805

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@article{1ac4c5d0991d47adb2ac0f2f06fd0dde,

title = "Transient experiments on oxidation and degradation of Cr-coated Zircaloy in steam up to 1600 ℃",

abstract = "The transient oxidation behavior of magnetron-sputtered chromium-coated Zircaloy-4 was studied in steam up to 1600 °C, and the microstructural evolution of the coating-substrate system after oxidation was investigated. Coating failure and corresponding rapid oxidation of coating and substrate occurred at 1300–1400 °C. It was mainly caused by the thickness decrease of the outer dense Cr2O3 scale, the Zr[sbnd]Cr eutectic reaction, the Zr[sbnd]Cr interdiffusion, and the precipitation of ZrO2 along unoxidized Cr grain boundaries. The phase transformation of tetragonal ZrO2−x to cubic ZrO2−y increased the oxidation rate of the Zircaloy-4 substrate at \textasciitilde{}1500 °C through the higher oxygen diffusion coefficient in the cubic phase.",

keywords = "ATF cladding, Cr coating, Failure behavior, High-temperature steam oxidation, Hydrogen release, Microstructural evolution",

author = "Junkai Liu and Chongchong Tang and Martin Steinbr{\"u}ck and Jianqiao Yang and Ulrike Stegmaier and Mirco Gro{\ss}e and Di Yun and Seifert, \{Hans J{\"u}rgen\}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = nov,

doi = "10.1016/j.corsci.2021.109805",

language = "英语",

volume = "192",

journal = "Corrosion Science",

issn = "0010-938X",

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TY - JOUR

T1 - Transient experiments on oxidation and degradation of Cr-coated Zircaloy in steam up to 1600 ℃

AU - Liu, Junkai

AU - Tang, Chongchong

AU - Steinbrück, Martin

AU - Yang, Jianqiao

AU - Stegmaier, Ulrike

AU - Große, Mirco

AU - Yun, Di

AU - Seifert, Hans Jürgen

PY - 2021/11

Y1 - 2021/11

N2 - The transient oxidation behavior of magnetron-sputtered chromium-coated Zircaloy-4 was studied in steam up to 1600 °C, and the microstructural evolution of the coating-substrate system after oxidation was investigated. Coating failure and corresponding rapid oxidation of coating and substrate occurred at 1300–1400 °C. It was mainly caused by the thickness decrease of the outer dense Cr2O3 scale, the Zr[sbnd]Cr eutectic reaction, the Zr[sbnd]Cr interdiffusion, and the precipitation of ZrO2 along unoxidized Cr grain boundaries. The phase transformation of tetragonal ZrO2−x to cubic ZrO2−y increased the oxidation rate of the Zircaloy-4 substrate at ~1500 °C through the higher oxygen diffusion coefficient in the cubic phase.

AB - The transient oxidation behavior of magnetron-sputtered chromium-coated Zircaloy-4 was studied in steam up to 1600 °C, and the microstructural evolution of the coating-substrate system after oxidation was investigated. Coating failure and corresponding rapid oxidation of coating and substrate occurred at 1300–1400 °C. It was mainly caused by the thickness decrease of the outer dense Cr2O3 scale, the Zr[sbnd]Cr eutectic reaction, the Zr[sbnd]Cr interdiffusion, and the precipitation of ZrO2 along unoxidized Cr grain boundaries. The phase transformation of tetragonal ZrO2−x to cubic ZrO2−y increased the oxidation rate of the Zircaloy-4 substrate at ~1500 °C through the higher oxygen diffusion coefficient in the cubic phase.

KW - ATF cladding

KW - Cr coating

KW - Failure behavior

KW - High-temperature steam oxidation

KW - Hydrogen release

KW - Microstructural evolution

UR - https://www.scopus.com/pages/publications/85109484165

U2 - 10.1016/j.corsci.2021.109805

DO - 10.1016/j.corsci.2021.109805

M3 - 文章

AN - SCOPUS:85109484165

SN - 0010-938X

VL - 192

JO - Corrosion Science

JF - Corrosion Science

M1 - 109805

ER -

Transient experiments on oxidation and degradation of Cr-coated Zircaloy in steam up to 1600 ℃

Abstract

Keywords

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