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Hot corrosion behavior of Fe-Cr-Ni alloys in thermal energy storage material of molten MgCl2/KCl/NaCl in inert atmosphere

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/
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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ding, WenjinWenjin.Ding (at) dlr.dehttps://orcid.org/0000-0001-5037-5810
Shi, HaoInstitute for Pulsed Power and Microwave Technology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, GermanyUNSPECIFIED
Xiu, YanleiYanlei.Xiu (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Weisenburger, AlfonsInstitute for Pulsed Power and Microwave Technology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, GermanyUNSPECIFIED
Jianu, AdrianInstitute for Pulsed Power and Microwave Technology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, GermanyUNSPECIFIED
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:23 April 2018
Journal or Publication Title:Solar Energy Materials and Solar Cells
Refereed publication:Yes
Open Access:No
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:10 Sep 2018 16:40

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