Corrosion Behavior of Hastelloy N and 316L Stainless Steel in Molten LiF-NaF-KF

doi:10.11902/1005.4537.2014.275

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (6): 543-548 DOI: 10.11902/1005.4537.2014.275

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Corrosion Behavior of Hastelloy N and 316L Stainless Steel in Molten LiF-NaF-KF

Xiangbin DING,Hua SUN(

),Guojun YU,Xingtai ZHOU

Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

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Abstract

The corrosion behavior of Hastelloy N and 316L stainless steel (316L) in molten eutectic LiF-KF-NaF (FLiNaK) salt at 700 ℃ for 1000 h was investigated by means of static corrosion tests, while the corroded alloys were examined by SEM and EPMA. It was found that Hastelloy N and 316L all suffered from steady corrosion, while the corrosion resistance of Hastelloy N was superior to that of 316L. Hastelloy N experienced slight uniform corrosion, which was mainly due to the outward diffusion of Cr from the alloy. While 316L suffered from significant intergranular corrosion, which was related to the outward diffusion of Cr along grain boundaries. In addition, the mass loss of Hastelloy N firstly increased, and then degraded slowly with exposure time, which was mainly attributed to the re-deposition of Ni and Fe from the molten salt on the surface of Hastelloy N. The mass loss of 316L increased obviously for the first 400 h, and then became stable. The different in corrosion behavior of the two alloys in molten fluoride salt was mainly associated with their difference in chemical composition.

Key words: Hastelloy N 316L stainless steel fluoride molten salt corrosion

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Xiangbin DING,Hua SUN,Guojun YU,Xingtai ZHOU. Corrosion Behavior of Hastelloy N and 316L Stainless Steel in Molten LiF-NaF-KF. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 543-548.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.275 OR https://www.jcscp.org/EN/Y2015/V35/I6/543

Table 1 Chemical compositions of Hastelloy N and 316L(mass fraction / %)

Fig.1 Schematic illustration of the static corrosioncapsule

Fig.2 Mass losses per unit area of Hastelloy N and 316L at different immersion times

Fig.3 Cross-section SEM images of Hastelloy N (a, c, e) and 316L (b, d, f) exposed for 50 h (a, b), 400 h (c, d) and 1000 h (e, f) in molten FLiNaK at 700 ℃

Fig.4 EPMA elements distribution mappings of Cr (a, b), Ni (c, d) and Fe (e, f) elements on the cross-sections of Hastelloy N (a, c, e) and 316L (b, d, f) exposed for 50 h (a1~f1) and 1000 h (a2~f2)

Fig.5 Gibbs free energy of formation per molecule of F₂ for the salt constituents and the metal flourides formed from tested alloys at 700 ℃

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