Corrosion behavior of 9Cr heat-resistant steel deposited metal with different Si contents in lead-bismuth

LIU Chen; WEI Shitong; WU Dong; LU Shanping

doi:10.12073/j.hjxb.20221129002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(8): 98-103. > DOI: 10.12073/j.hjxb.20221129002

LIU Chen, WEI Shitong, WU Dong, LU Shanping. Corrosion behavior of 9Cr heat-resistant steel deposited metal with different Si contents in lead-bismuth[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(8): 98-103. DOI: 10.12073/j.hjxb.20221129002

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Corrosion behavior of 9Cr heat-resistant steel deposited metal with different Si contents in lead-bismuth

LIU Chen^{1, 2,},
WEI Shitong^{1, 3},
WU Dong^{1, 3},
LU Shanping^1, ,

1.
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
2.
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
3.
Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

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Received Date: November 28, 2022
Available Online: July 14, 2023

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Abstract

Abstract

In order to investigate the effect of Si content on the corrosion behavior of 9Cr ferritic-martensitic heat-resistant steel deposited metal in liquid lead-bismuth alloy, corrosion experiments were performed on 9Cr ferritic-martensitic steel deposited metal with different Si contents in saturated oxygen and controlled oxygen (oxygen concentration: 1 ×10⁻⁶ ~ 5 × 10⁻⁶ wt.%) static lead-bismuth at 550 ℃, respectively. The results show that the double-layered oxide scale forms on the surface of deposited metal in saturated oxygen lead-bismuth at 550 ℃, and the discontinuous passivation layer and the double-layered oxide scale with uneven thickness form on deposited metal in oxygen-controlled lead-bismuth at 550 ℃. The passivation layer will fail in some areas during the corrosion process through penetration mechanism and film breakdown mechanism, where oxidation aggravates to form the double-layered oxide scale. With the increase of Si content in the deposited metal, the thickness of the oxide layer in the saturated oxygen lead-bismuth decreases, the continuity of the passivation layer in the controlled oxygen lead-bismuth increases, and the corrosion resistance of the deposited metal in the lead-bismuth increases.
- lead-bismuth alloy,
- ferritic-martensitic steel,
- deposited metal,
- Si content,
- oxidation corrosion

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References (21)

References

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Corrosion behavior of 9Cr heat-resistant steel deposited metal with different Si contents in lead-bismuth