Impact of temperature on corrosion behavior of austenitic stainless steels in solar salt for CSP application: An electrochemical study

Gong, Jianming; Feng, Xiucheng; Wang, Xiaowei; Yang, Xinyu; Tang, Jianqun; Gong, Jianming

doi:10.1016/j.solmat.2022.111661

Cited by 15 publications

(6 citation statements)

References 39 publications

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“…In this context, austenitic stainless steels, and specifically, 316L stainless steel, are the most used structural materials in many industries, mainly due to their good corrosion resistance, which is attributed to the addition of Cr and Mo [17][18][19], and their good mechanical properties at high temperatures [20]. Moreover, its good oxidation resistance makes 316L stainless steel an excellent candidate to be used in CSP plants and high-temperature parts such as pipelines or hot tanks manufactured with stainless steel [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Molten Salts Composition on the Corrosion Behavior of Additively Manufactured 316L Stainless Steel for Concentrating Solar Power

Abu-warda,

García-Rodríguez,

Torres

et al. 2024

Metals

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The effects of different molten salts on the corrosion resistance of laser powder bed fusion (L-PBF) 316L stainless steel was evaluated at 650 and 700 °C. The samples were characterized via XRD and SEM/EDX after high-temperature corrosion tests to evaluate the corrosion damage to the L-PBF 316L stainless steel caused by the molten salts. The presence of the salts accelerated the corrosion process, the chloride-based salts being the most aggressive ones, followed by the carbonate-based and the nitrate/nitrite-based salts, respectively. The L-PBF 316L did not react strongly with the nitrate/nitrite-based salts, but some corrosion products not found in the samples tested in the absence of salts, such as NaFeO2, were formed. LiFeO2 and LiCrO2 were identified as the main corrosion products in the samples exposed to the carbonate-based molten salts, due to the high activity of Li ions. Their growth produced the depletion of Fe and Cr elements and the formation of vacancies that acted as diffusion paths on the surface of the steel. In the samples exposed to chloride-based molten salts, the attacked area was much deeper, and the corrosion process followed an active oxidation mechanism in which a chlorine cycle is assumed to have been involved.

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Section: Introductionmentioning

confidence: 99%

Effect of Molten Salts Composition on the Corrosion Behavior of Additively Manufactured 316L Stainless Steel for Concentrating Solar Power

Abu-warda,

García-Rodríguez,

Torres

et al. 2024

Metals

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“…The limitation of the operating temperature can directly be connected to the stability of the nitrate ion (

) in terms of decomposition and consequent changes of the salt's thermodynamic properties as well as corrosivity towards the structural materials [ 7 , [11] , [12] , [13] , [14] , [15] , [16] ]. It is well established that the nitrate ion is decomposing with a reversible reaction, according to reaction (1) to nitrite ions (

) and oxygen (O 2 ).…”

Section: Introductionmentioning

confidence: 99%

Demonstration of the stabilization of solar salt at 620 C with a semi-closed configuration in a 100 kg-scale

Kunkel,

Seeliger,

Hanke

et al. 2023

Heliyon

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“…Molten salts exhibit excellent characteristics for thermal transfer and storage: wide temperature range, high specific heat capacity, and low viscosity 6 . These characteristics make molten salts outstanding materials for thermal energy storage 11 . Solar Salt (60 mol% NaNO 3 :40 mol% KNO 3 ), as a thermal storage medium that has been widely used in commercial solar thermal power generation, has excellent physicochemical properties, low melting point, and good thermal stability 12 .…”

Section: Introductionmentioning

confidence: 99%

“…6 These characteristics make molten salts outstanding materials for thermal energy storage. 11 Solar Salt (60 mol% NaNO 3 :40 mol% KNO 3 ), as a thermal storage medium that has been widely used in commercial solar thermal power generation, has excellent physicochemical properties, low melting point, and good thermal stability. 12 The latest data from the Solar PACES website 13 shows that CSP projects worldwide have reached 9162 MW (including operating, under construction, and development) as of September 2021.…”

Section: Introductionmentioning

confidence: 99%

“…15 Although Solar Salt is considered a relatively stable and moderately corrosive molten salt, it's chemical decomposition is very sensitive to two factors: atmospheric conditions and operating temperature. 11 Since Solar Salt has been successfully industrialized for a long time, to further improve its performance and deepen its understanding, numerous researchers have focused on and conducted a large amount of research on the decomposition of molten nitrate salts. Wang et al 16 used TG/DTA to study the eutectic state of LiNO 3 -NaNO 3 -KNO 3 ternary salt mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Acceleration of thermal decomposition of molten nitrates by Cr in steel and promotion of this effect by halogens

et al. 2022

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Molten salts have been widely studied as the most common heat storage medium for concentrated solar power (CSP) plants. However, most studies have focused on the corrosiveness of molten salts, while this study innovatively reveals the role of stainless steel in promoting the decomposition of molten salts and the mechanism by which the halogen ions accelerate this process. Considering commercial Solar Salt as an example, the thermal stability, composition, and thermophysical properties of Solar Salt adding Cl−, Br−, and I− after contacting different stainless steel were analyzed. The results showed that Cr was the main reason for the decomposition of the molten salt, and Cl−, Br−, and I−, all accelerated the decomposition. Meanwhile, different halogen ions promoted the decomposition of molten salts through different mechanisms: oxide layer destruction and chain oxidation.

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Impact of temperature on corrosion behavior of austenitic stainless steels in solar salt for CSP application: An electrochemical study

Cited by 15 publications

References 39 publications

Effect of Molten Salts Composition on the Corrosion Behavior of Additively Manufactured 316L Stainless Steel for Concentrating Solar Power

Effect of Molten Salts Composition on the Corrosion Behavior of Additively Manufactured 316L Stainless Steel for Concentrating Solar Power

Demonstration of the stabilization of solar salt at 620 C with a semi-closed configuration in a 100 kg-scale

Acceleration of thermal decomposition of molten nitrates by Cr in steel and promotion of this effect by halogens

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