Corrosion Behavior of 304 and 316H Stainless Steels in Molten LiF-NaF-KF

doi:10.11902/1005.4537.2018.001

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 51-58 DOI: 10.11902/1005.4537.2018.001

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Corrosion Behavior of 304 and 316H Stainless Steels in Molten LiF-NaF-KF

Hui LIU^1,²,Wei QIU¹(

),Bin LENG²(

),Guojun YU²

1. School of Energy and Power Engineering, Changsha University of Scinece & Technology, Changsha 410114, China
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

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Abstract

The corrosion behavior of 304 and 316H stainless steels in molten LiF-NaF-KF(FLiNaK) salt at 700 ℃ was studied by static immersion test, followed by SEM/EDS and EPMA analyses. Results show that the corrosion characteristics of the two stainless steels in molten FLiNaK salt are mainly selective depletion of Cr from the surface and grain boundaries underneath the surface. The corrosion depth and weight loss of 316H stainless steel are lower than those of 304 stainless steel, which may be ascribed to the Mo addition in 316H steel. After corrosion, the two steels show surface corrosion layers enriched in Ni and Fe, as well as nano-sized precipitates in the steel matrix near the surface. EDS analyses suggest these precipitates to be Cr and Al nitrides or carbonitrides. The formation of these precipitates significantly increases the hardness of the materials.

Key words: 304 stainless steel 316H stainless steel molten fluoride salt intergranular corrosion nano-sized precipitate

Received: 02 January 2018

ZTFLH:

TG172.6

Fund: Supported by National Natural Science Foundation of China(51301025);Supported by National Natural Science Foundation of China(51141001);Supported by National Natural Science Foundation of China(51501217)

Corresponding Authors: Wei QIU,Bin LENG E-mail: hncsqqwk86@163.com;lengbin@sinap.ac.cn

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Cite this article:

Hui LIU,Wei QIU,Bin LENG,Guojun YU. Corrosion Behavior of 304 and 316H Stainless Steels in Molten LiF-NaF-KF. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 51-58.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.001 OR https://www.jcscp.org/EN/Y2019/V39/I1/51

Table 1 Chemical compositions of 304 and 316H stainless steels (mass fraction / %)

Fig.1 Schematic illustration of the static corrosion capsule

Table 2 Element contents of Cr, Fe and Ni in FLiNaK salt after corrosion (mg/L)

Fig.2 SEM images of the surfaces of 304 (a) and 316H (b) stainless steels after corrosion at 700 ℃ in FLiNaK salt for 400 h

Fig.3 Cross sections (a, e) and EPMA elemental distribution mappings of Cr (b, f), Fe (c, g) and Ni (d, h) of 304 (a~d) and 316H (e~h) stainless steels after corrosion in FLiNaK salt for 400 h

Fig.4 Back scattered electron images (a, b) and the magnified images of areas I (c), II (e) in Fig.4a and III (d), IV (f) in Fig.4b of the cross-sections and EDS line scanning results (g, h) across the grain boundaries in the unaffected zones (along the marked lines) for 304 (a, c, e, g) and 316H (b, d, f, h) stainless steels after corrosion in FLiNaK salt at 700 ℃ for 400 h

Table 3 EDS analysis results of different areas of 304 and 316H stainless steels after corrosion (the numbers in the brackets correspond to the reference signs of the areas in Fig.4) (mass fraction / %)

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