The corrosion behaviour of stainless steels and Ni-based alloys in nitrate salts under thermal cycling conditions in concentrated solar power plants

Liu, Qingyang; Barker, Richard; Wang, Chun; Qian, Jiong; Neville, Anne; Pessu, Frederick

doi:10.1016/j.solener.2021.12.072

Cited by 27 publications

(3 citation statements)

References 28 publications

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“…CSP technologies are among the most viable and promising renewable energy technologies that can be scaled up for a rapid transition towards high renewable energy utilization scenario (Calvet et al, 2021;Fang and Zhao, 2020;Giaconia et al, 2020;Laporte-Azcué et al, 2020;Liu et al, 2022;Martínez et al, 2020;Powell et al, 2017;W. Wang et al, 2021;Wang, 2019).…”

Section: Introductionmentioning

confidence: 99%

Progress in research and technological advancements of commercial concentrated solar thermal power plants

2023

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Section: Introductionmentioning

confidence: 99%

Progress in research and technological advancements of commercial concentrated solar thermal power plants

2023

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“…Ni-based alloys showed better corrosion resistance than SS 321 and 347 due to superior passivation of combined enrichment of Cr and Ni. NiO and Cr 2 O 3 are formed as the inner corrosion layer product on the material surface when reacting with oxygen [18]. Qin et al studied Na 2 SO 4 as PCM and diatomite as a matrix material to formulate the composite of Na 2 SO 4 -diatomite with a melting point of 880°C.…”

Section: Introductionmentioning

confidence: 99%

Investigation of corrosion behaviour on Ni–Cr–Co and Ni–Cr–Mo alloys exposed to molten salt for thermal energy storage applications

Kumar

Manoharan

2022

Corrosion Engineering, Science and Technology

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This research mainly focuses on selecting phase change materials (PCM) and container materials for next-generation concentrated solar power plants (CSP). The present study investigates the hot corrosion behaviour of Inconel 617 and 625 in Na 2 SO 4 + 45 wt-% diatomite PCM environment at 800°C for 40, 80 and 120 h. Oxide scales developed on the alloy surfaces were examined by Scanning electron microscope (SEM) and X-ray diffraction (XRD) to study morphology and oxide phases. The result indicates that Inconel 617 and 625 weight changes were 1.239 and 0.925 mg cm −2 at 800°C for a maximum duration of 120 h. The dense oxide of Cr 2 O 3 is formed on alloys 617 and 625, which gives better oxidation resistance in a PCM environment. Moreover, the Inconel 625 shows lesser weight gain compared to Inconel 617 due to the presence of higher wt-% of Cr in the alloy and Nb formation oxides reducing corrosion species diffusion rate.

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“…Установлено, что межкристаллитная коррозия -это тип коррозии, за который ответственны technology карбиды хрома Cr 23 C 6 , выделяющиеся по границам аустенитных зёрен и способствующие снижению растворенного в матрице хрома до значений (менее 13 %), обеспечивающих локальное падение коррозионной стойкости [12][13][14]. Этот процесс интенсифицируется в течение длительных выдержек при температурах, соответствующих активному формированию карбида хрома, при этом коррозия распространяется в глубину зерна.…”

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Analysis of the reasons for the formation of defects in the 12-Cr18-Ni10-Ti steel billets and development of recommendations for its elimination

Ryaboshuk¹,

Kovalev²

2023

Metal Working and Material Science

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Introdution. Austenitic steel (e.g., AISI 304, AISI 321, AISI 316, AISI 403, 12-Cr18-Ni10-Ti, etc.) is widespread, which is caused by high corrosion resistance and the corresponding possibility of use in aggressive media. The following most common types of 12-Cr18-Ni10-Ti steel defects can be distinguished: integranular corrosion, martensitic orientation of the α-phase and ferrite δ-phase. The purpose of work: to analyze the defects formation reasons of the 12-Cr18-Ni10-Ti steel grade billets and to develop recommendations for their elimination. The methods of investigation. Tests of 12-Cr18-Ni10-Ti steel samples for resistance to integranular corrosion, metallographic analysis of defects were carried out in this work. Hardness measurements were carried out for various degrees of billets reduction. Thermodynamic calculations of phase equilibrium in multicomponent steel for different temperatures were performed by the Thermo-Calc software. Results and Discussion. It is determined that in order to prevent integranular corrosion, it is necessary to reduce the nitrogen and carbon content in steel at the stage of ladle refining to 0.05%, and also to ensure the concentration of titanium in steel is not less than the permissible value — 0.3%. These measures contribute to the reduction of Cr23C6 chromium carbides responsible for integranular corrosion. It is necessary to reduce the degree of compression of the billets to a level of no more than 50% to prevent the appearance of a ferromagnetic martensitic α-phase, since the formation of this defect is associated with a high degree of compression during drawing. The high-temperature phase of δ-ferrite exists in the metal structure in a wide temperature range. Reducing this range to 100 degrees or less by optimizing the composition of the carbon and chromium alloy in accordance with GOST 5632-2014 leads to a significant reduction of the amount of ferrite. However, it is not possible to completely eliminate it from the structure of steel. For all cases, it is necessary to assign austenization of billets in the temperature range of 1,050…1,100 °C.

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The corrosion behaviour of stainless steels and Ni-based alloys in nitrate salts under thermal cycling conditions in concentrated solar power plants

Cited by 27 publications

References 28 publications

Progress in research and technological advancements of commercial concentrated solar thermal power plants

Progress in research and technological advancements of commercial concentrated solar thermal power plants

Investigation of corrosion behaviour on Ni–Cr–Co and Ni–Cr–Mo alloys exposed to molten salt for thermal energy storage applications

Analysis of the reasons for the formation of defects in the 12-Cr18-Ni10-Ti steel billets and development of recommendations for its elimination

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