Effect of Cr2+/Cr3+ on Galvanic Corrosion Inhibition of Dissimilar Metallic Materials in 46.5%LiF-11.5%NaF-42.0%KF Molten Salts System

doi:10.11902/1005.4537.2020.090

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (3): 341-345 DOI: 10.11902/1005.4537.2020.090

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Effect of Cr²⁺/Cr³⁺ on Galvanic Corrosion Inhibition of Dissimilar Metallic Materials in 46.5%LiF-11.5%NaF-42.0%KF Molten Salts System

ZUO Yong¹^,²^,³(

), QIN Yueqiang¹^,³, SHEN Miao¹^,², YANG Xinmei¹^,²^,³

^1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
^2.Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, China
^3.University of Chinese Academy of Sciences, Beijing 100049, China

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Abstract

Galvanic corrosion should be considered when dissimilar metallic materials in contact with each other in a molten salt system of high ionic conductivity. Corrosion electrochemistry and immersion corrosion tests indicated that the difference of the corrosion potentials of different metal materials can be decreased or diminished by coupling Cr²⁺/Cr³⁺ into the 46.5%LiF-11.5%NaF-42.0%KF (in mole fraction) molten salt. Thus, the galvanic corrosion behavior between different metal materials can be effectively inhibited.

Key words: molten salt galvanic corrosion redox buffering ion pair corrosion mitigation

Received: 25 May 2020

ZTFLH:

O646.6

Fund: Strategic Priority Research Program of Chinese Academy of Sciences(XDA21000000)

Corresponding Authors: ZUO Yong E-mail: zuoyong@sinap.ac.cn

About author: ZUO Yong, E-mail: zuoyong@sinap.ac.cn

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Cite this article:

ZUO Yong, QIN Yueqiang, SHEN Miao, YANG Xinmei. Effect of Cr²⁺/Cr³⁺ on Galvanic Corrosion Inhibition of Dissimilar Metallic Materials in 46.5%LiF-11.5%NaF-42.0%KF Molten Salts System. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 341-345.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.090 OR https://www.jcscp.org/EN/Y2021/V41/I3/341

Fig.1 Polarization curves of different metal materials in molten FliNaK (a), molten FLiNaK+680 μg/g CrF₃ (b) and molten FLiNaK+680 μg/g CrF₃+720 μg/g CrF₂ (c)

Fig.2 Variation of the corrosion potentials in molten FLiNaK+1000 μg/g CrF₃ with the adding of CrF₂

Fig.3 Galvanic corrosion current-time curves of 316LSS vs GH3535 alloy in different molten salt systems

Fig.4 Cross-sectional image of the 316LSS (connected with equal area GH3535) exposed in molten FliNaK (a), molten FLiNaK+300 μg/g CrF₃ (b) and molten FLiNaK+680 μg/g CrF₃+720 μg/g CrF₂ (c) for 24 h

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