Effect of SO42− on the corrosion of 316L stainless steel in molten FLiNaK salt

Qiu, Jie; Leng, Bin; Liu, Huajian; Macdonald, Digby D.; Wu, Angjian; Jia, Yanyan; Xue, Wandong; Yu, Ge; Zhou, Xingtai

doi:10.1016/j.corsci.2018.08.057

Cited by 46 publications

(9 citation statements)

References 30 publications

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“…The corrosion resistance of molten-salt-resistant structural materials depends on the material composition, molten salt composition, and molten salt purity. These factors reflect the thermodynamic driving force of the alloy elements dissolving into molten salt and diffusion rate of the alloy elements from the matrix to the surface [12][13][14] . Because the operating temperature of molten salt is significantly higher than that of a conventional heat transfer medium, alloy materials under the action of molten salt experience performance-limiting conditions, whereby small environment fluctuations lead to significant changes in the material structure and properties 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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The use of molten-salt–based energy production and storage systems requires high-temperature corrosion- and creep-resistant structural materials. This study investigated the microstructure evolution and corrosion characteristics of Hastelloy N under working stress in a molten salt environment. Selective diffusion of Cr at the grain boundaries (GBs) of the Hastelloy N degraded the properties of the GBs, making them preferred locations for corrosion crack invasion. Stress further promoted Cr diffusion and accelerated GB carbide precipitation, thereby forming a corrosion couple between the carbide and matrix that facilitated the expansion of intergranular corrosion cracks into the grains. These findings are useful for providing advances in the design of novel structural alloys with extraordinary property-microstructure stability combinations for resistant to complex molten salt environments.

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Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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“…In some previous studies [11,14,15], SO 4 2− and HCO 3 − were found to be detrimental to steels. Qiu [14] and Zhu [15] investigated the effect of SO 4 2− on the corrosion of 316L stainless steel and Ni-Mo-Cr alloy (GH3535) in FLiNaK molten salt, respectively. The results suggested that SO 4 2− accelerates the corrosion of both types of steel.…”

Section: The Corrosion Initiation Of Stainless Steel In Underground Watermentioning

confidence: 81%

“…However, some other studies [12,13] suggested that HCO 3 − ions have an inhibitive effect on corrosion. Moreover, the effect of SO 4 2− ions on the corrosion behavior of steels is also controversial [14][15][16][17]. Some reports [14,15] indicated that SO 4 2− can lead to the dissolution of Cr and accelerate corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the effect of SO 4 2− ions on the corrosion behavior of steels is also controversial [14][15][16][17]. Some reports [14,15] indicated that SO 4 2− can lead to the dissolution of Cr and accelerate corrosion. By contrast, some other reports [16,17] found the SO 4 2− can inhibit general corrosion and pitting corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, some other reports [16,17] found the SO 4 2− can inhibit general corrosion and pitting corrosion. It is worth noting that those studies [11][12][13][14][15][16][17] scarcely paid attention to the corrosion behavior of steels in underground waters.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Study of Stainless Steel Anchor Bolt Corrosion Initiation in Corrosive Underground Water

Zeng

et al. 2021

Processes

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Application of low-nickel stainless steel anchor was one of the economical and effective methods to solve the durability problem of slope engineering. At present, there are scarce reports about corrosion characteristics of low-nickel stainless steel in various underground waters. For investigating the corrosion initiation of stainless steel anchor bolt in corrosive underground water, the effect of SO42−, HCO3− and pH value on the corrosion behavior of 201 low-nickel stainless steel was studied via electrochemical methods. As the SO42− concentration, HCO3− concentration or pH value increase, the open circuit potential and polarization resistance increase, while the double-layer capacitance, donor density and passive current density decrease. The results indicate that corrosion is inhibited by SO42−, HCO3− and OH− in underground water. In addition, the inhibitive efficiency of SO42− and HCO3− increases with the SO42− and HCO3− concentration.

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Corrosion behavior and mechanism of 316 stainless steel in NaCl–KCl–FeCl₃ molten salt and vapor at 300°C

Yang

Guo

Chen

et al. 2023

Materials & Corrosion

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The corrosion behavior of 316 stainless steel (316 SS) in NaCl–KCl–FeCl3 molten salt and vapor was studied at 300°C for 150, 300, and 500 h in Ar. The weight change, the micromorphology, element distribution, and crystal structure of the 316 SS alloy were analyzed by scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray diffraction. 316 SS alloys suffered from weight loss, significant visible corrosion shedding, and corrosion holes. The corrosion holes and corrosion shedding block of the 316 SS alloys become more and more serious with the increase in corrosion time. The corrosion depth of the corroded 316 SS alloys in NaCl–KCl–FeCl3 molten salt and vapor for 500 h can even reach up to 20.0 and 14.0 μm, respectively. 316 SS alloys in NaCl–KCl–FeCl3 molten salts underwent a more serious corrosion attack than that in the NaCl–KCl–FeCl3 vapor at 300°C due to the strong oxidizing compound FeCl3 in the molten salt. It not only offers a new insight into the corrosion behavior of 316 SS alloys in the chloride salts and corresponding vapor but also enriches the corrosion databases of the chloride salts.

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Effect of SO42− on the corrosion of 316L stainless steel in molten FLiNaK salt

Cited by 46 publications

References 30 publications

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Electrochemical Study of Stainless Steel Anchor Bolt Corrosion Initiation in Corrosive Underground Water

Corrosion behavior and mechanism of 316 stainless steel in NaCl–KCl–FeCl₃ molten salt and vapor at 300°C

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Effect of SO42− on the corrosion of 316L stainless steel in molten FLiNaK salt

Cited by 46 publications

References 30 publications

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Electrochemical Study of Stainless Steel Anchor Bolt Corrosion Initiation in Corrosive Underground Water

Corrosion behavior and mechanism of 316 stainless steel in NaCl–KCl–FeCl3 molten salt and vapor at 300°C

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Product

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About

Corrosion behavior and mechanism of 316 stainless steel in NaCl–KCl–FeCl₃ molten salt and vapor at 300°C