Effect of the 345 °C and 16.5 MPa autoclave corrosion on the oxidation behavior of Cr-coated zirconium claddings in the high-temperature steam

Liu, Haiyong; Feng, Yan; Yao, Yuqin; Li, Bingsheng; Wang, Renda; Shi, Xiaohong; Shu, Jie; Huang, Feng; Huang, Qing; Ge, Fangfang

doi:10.1016/j.corsci.2021.109608

Cited by 45 publications

(9 citation statements)

References 19 publications

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“…The residual Cr coating still maintains the columnar crystal structure and close contact with the Cr 2 O 3 scale. Our previous work also revealed that very thin Cr 2 O 3 tissue formed on the outmost surface and along the columnar boundaries during the immersion process [ 41 , 42 ], which could effectively prevent the inter-diffusion of corrosive medium towards the underneath SiC substrate. Generally speaking, the columnar grain boundary will act as a fast diffusion channel of corrosion medium.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Corrosion of SiC Coupons Suppressed by Magnetron Sputtered Cr Coatings

et al. 2022

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SiC-based components are sometimes susceptible to aqueous dissolution in LWR coolant environments. To address this issue, ~10 μm thick Cr coatings was deposited on reaction-bonded silicon carbide (RBSC) plates by magnetron sputtering. Corrosion behavior of Cr-coated SiC and -uncoated SiC coupons was studied by immersing in autoclave (345°C and 16.5 MPa). The weight loss of the Cr coated SiC coupons (3.02% after the 93-days) in the autoclave tests was effectively reduced due to their Cr-coated surfaces, in contrast to the uncoated ones (20.4% after the 78-days). Moreover, microstructural and compositional evolutions were examined by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. It was revealed that a continuous and dense Cr2O3 layer formed on the surface after the hydrothermal corrosion, which can suppress the in-diffusion of corrosive medium.

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Section: Resultsmentioning

confidence: 99%

Hydrothermal Corrosion of SiC Coupons Suppressed by Magnetron Sputtered Cr Coatings

et al. 2022

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“…A thicker Cr 2 O 3 layer was formed on the surface after 1473 K steam oxidation for 240 min. A criterion for the scale failure is given in the following equation [ 34,35 ] :

(1-v){\sigma }^{2}h/E\gt {G}_{{\rm{c}}}\text{,}

where E is the elastic modulus, v is the Poisson's ratio, h is the scale thickness, σ is the equal biaxial residual stress of the scale, and G c is the work per unit area required for decohesion at the oxide–metal interface. The formation of a surface Cr 2 O 3 layer results in a large volume expansion, which leads to the accumulation of growth stress (the Pilling–Bedworth ratio for Cr 2 O 3 /Cr is 2.07).…”

Section: Resultsmentioning

confidence: 99%

“…A thicker Cr 2 O 3 layer was formed on the surface after 1473 K steam oxidation for 240 min. A criterion for the scale failure is given in the following equation [34,35] :…”

Section: Analysis Of the Oxidation Processmentioning

confidence: 99%

Long‐term high‐temperature steam oxidation behavior of Cr‐coated Zircaloy‐4 alloy for accident tolerant fuel

Xiang

Yang

Chen

et al. 2022

Materials & Corrosion

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The Cr-coated Zircaloy-4 samples were prepared by arc ion plating to enhance the high-temperature oxidation resistance of Zircaloy-4 alloys for accident tolerant fuel claddings. The oxidation tests of the Cr coating were performed under 1473 K steam for 60, 120, and 240 min. The steam oxidation tests indicated that the Cr-coated Zircaloy-4 substrate had excellent hightemperature steam oxidation resistance to protect the fuel cladding from damage for at least 240 min. The weight gains and the thickness of the oxidation scale of the samples were measured to evaluate the oxidation kinetics of the Cr coating in 1473 K steam. In addition, the diffusion and interfacial evolution were analyzed during the oxidation process, and the steam oxidation behaviors of the Cr coatings were also discussed in detail.

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“…Metallic Cr coatings attract much attention due to their high melting point, high oxidation resistance and thermal expansion coefficient similar to Zr alloys. A lot of studies demonstrated and approved the excellent oxidation performance of Cr-coated Zr alloys [3,4,[8][9][10][11][12][13][14][15][16][17][18][19][20]. However, Cr coatings should not negatively impact the neutronic balance.…”

Section: Introductionmentioning

confidence: 99%

Influence of coating parameters on oxidation behavior of Cr-coated zirconium alloy for accident tolerant fuel claddings

et al. 2022

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Effect of the 345 °C and 16.5 MPa autoclave corrosion on the oxidation behavior of Cr-coated zirconium claddings in the high-temperature steam

Cited by 45 publications

References 19 publications

Hydrothermal Corrosion of SiC Coupons Suppressed by Magnetron Sputtered Cr Coatings

Hydrothermal Corrosion of SiC Coupons Suppressed by Magnetron Sputtered Cr Coatings

Long‐term high‐temperature steam oxidation behavior of Cr‐coated Zircaloy‐4 alloy for accident tolerant fuel

Influence of coating parameters on oxidation behavior of Cr-coated zirconium alloy for accident tolerant fuel claddings

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