Ding, Wenjin and Shi, Hao and Xiu, Yanlei and Bonk, Alexander and Weisenburger, Alfons and Jianu, Adrian and Bauer, Thomas (2018) Hot corrosion behavior of Fe-Cr-Ni alloys in thermal energy storage material of molten MgCl2/KCl/NaCl in inert atmosphere. Solar Energy Materials and Solar Cells, 184, pp. 22-30. Elsevier. DOI: 10.1016/j.solmat.2018.04.025 ISSN 0927-0248
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Abstract
Hot corrosion behavior of three commercial Fe-Cr-Ni alloys (SS 310, Incoloy 800 H, Hastelloy C-276) in molten MgCl2/NaCl/KCl (60/20/20 mole%) in inert atmosphere was investigated by long-term immersion tests at 700 °C for 500 hours. SS 310 performed the highest corrosion rate, while Hastelloy C-276 showed the best corrosion resistance performance. Unfortunately, all the studied alloys could not fulfill the requirements of the commercial applications (< 10 µm/year for 30 years lifetime). Microstructural analysis on the exposed alloy samples via SEM, EDX and XRD shows that Cr was dissolved preferentially than Fe and Ni to form a corrosion layer with a porous structure during the corrosion. Moreover, the corrosion products (e.g., MgO, MgCr2O4, etc) precipitated on the surface of the exposed samples, as well as in the Cr-depleted holes in the corrosion layer. For SS 310, which contains 2 wt% Si, Si was also dissolved and corrosion products containing Si were observed in the holes of the corrosion layer. Based on these, an impurity-driven corrosion mechanism was proposed for the hot corrosion behavior of Fe-Cr-Ni alloys in molten MgCl2/NaCl/KCl in inert atmosphere, which could assist the development of corrosion control technologies in future work.
Item URL in elib: | https://elib.dlr.de/120994/ | ||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||
Title: | Hot corrosion behavior of Fe-Cr-Ni alloys in thermal energy storage material of molten MgCl2/KCl/NaCl in inert atmosphere | ||||||||||||||||||||||||
Authors: |
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Date: | 23 April 2018 | ||||||||||||||||||||||||
Journal or Publication Title: | Solar Energy Materials and Solar Cells | ||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||
Volume: | 184 | ||||||||||||||||||||||||
DOI : | 10.1016/j.solmat.2018.04.025 | ||||||||||||||||||||||||
Page Range: | pp. 22-30 | ||||||||||||||||||||||||
Publisher: | Elsevier | ||||||||||||||||||||||||
ISSN: | 0927-0248 | ||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||
Keywords: | Concentrated solar power (CSP), Molten chlorides, Impurity-driven corrosion, Corrosion mechanism. | ||||||||||||||||||||||||
HGF - Research field: | Energy | ||||||||||||||||||||||||
HGF - Program: | Storage and Cross-linked Infrastructures | ||||||||||||||||||||||||
HGF - Program Themes: | Thermal Energy Storage | ||||||||||||||||||||||||
DLR - Research area: | Energy | ||||||||||||||||||||||||
DLR - Program: | E SP - Energy Storage | ||||||||||||||||||||||||
DLR - Research theme (Project): | E - Thermochemical Processes (Storage) | ||||||||||||||||||||||||
Location: | Stuttgart | ||||||||||||||||||||||||
Institutes and Institutions: | Institute of Engineering Thermodynamics > Thermal Process Technology | ||||||||||||||||||||||||
Deposited By: | Ding, Wenjin | ||||||||||||||||||||||||
Deposited On: | 07 Sep 2018 14:18 | ||||||||||||||||||||||||
Last Modified: | 01 Sep 2020 03:00 |
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