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Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials

Ding, Wenjin and Shi, Hao and Jianu, Adrian and Xiu, Yanlei and Bonk, Alexander and Weisenburger, Alfons and Bauer, Thomas (2019) Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials. Solar Energy Materials and Solar Cells. Elsevier. ISSN 0927-0248

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Abstract

Molten chloride salts are promising advanced high-temperature (400-800°C) thermal energy storage (TES) and heat transfer fluid (HTF) materials in next generation concentrated solar power (CSP) plants for higher energy conversion efficiencies. However, severe corrosion of structural materials in contact with molten chloride salts is one of the most critical challenges limiting their applications at elevated temperatures. In this work, two corrosion mitigation strategies are investigated to alleviate the hot corrosion of structural materials in molten chloride salts: (1) adding corrosion inhibitor and (2) using a Fe-Cr-Al alloy with a protective alumina layer on the surface after pre-oxidation. Three commercial high temperature Fe-Cr-Ni alloys (SS 310, Incoloy® 800 H and Hastelloy® C-276) were exposed to molten MgCl2-NaCl-KCl (60-20-20 mole.-%) mixed salts with 1 wt.-% Mg as corrosion inhibitor, for 500h at 700°C under inert atmosphere. By addition of the Mg inhibitor, the corrosion rates of the studied alloys were found to be significantly reduced, more precisely by ~83 % for SS 310, ~70 % for In 800 H and ~94 % for Ha C-276 compared with the exposure tests without Mg addition. To assess the second mitigation strategy two pre-oxidized alumina forming Fe-Cr-Al alloys were exposed to the same molten chloride salts without Mg corrosion inhibitor under the same conditions. It is observed that the adherent alumina scales can effectively inhibit the dissolution of Cr and Fe and the bulk penetration of corrosive impurities. Overall, both strategies offer enormous potential for enhancing the expected lifetime of commercial alloys in molten chloride salts.

Item URL in elib:https://elib.dlr.de/125443/
Document Type:Article
Title:Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ding, WenjinWenjin.Ding (at) dlr.deUNSPECIFIED
Shi, HaoInstitute 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
Xiu, YanleiYanlei.Xiu (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Weisenburger, AlfonsInstitute for Pulsed Power and Microwave Technology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, GermanyUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:2019
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
Publisher:Elsevier
ISSN:0927-0248
Status:Accepted
Keywords:Concentrated solar power (CSP), Thermal energy storage (TES), Molten salts, Corrosion mitigation, Corrosion inhibitor, Alumina forming Fe-Cr-Al alloys.
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: Bonk, Alexander
Deposited On:20 Dec 2018 14:52
Last Modified:11 Jan 2019 15:00

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