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Impact of Solar Salt aging on corrosion of martensitic and austenitic steel for concentrating solar power plants

Bonk, Alexander and Rückle, Dagmar and Kaesche, Stefanie and Braun, Markus and Bauer, Thomas (2019) Impact of Solar Salt aging on corrosion of martensitic and austenitic steel for concentrating solar power plants. Solar Energy Materials and Solar Cells, 203, pp. 110162-1. Elsevier. DOI: 10.1016/j.solmat.2019.110162 ISSN 0927-0248

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Abstract

This work addresses the influence of molten nitrate salt chemistry on the corrosion behavior of a martensitic high temperature steel and an austenitic stainless steel. It is one of the first addressing controlled degradation of Solar Salt by controlling the gas atmosphere on top of the melt, thus driving the formation of corrosive ions, mainly oxide ions but also nitrite ions. The stainless steel and high temperature steel samples are subjected to the different operating conditions to demonstrate the variations in corrosivity as a function of gas atmosphere and additionally of artificially added chloride impurities. The results indicate that the atmosphere has a direct impact on the formation of corrosive oxide and nitrite ions. The low Cr-steel is found to be more sensitive to chloride impurities, while the stainless steel corrosion is enhanced by the presence of nitrites and oxide ions. All studies are supported by profound molten salt analysis throughout the experiments including the analysis of nitrate, nitrite, oxide and chromate ions as well as cation compositions. Steel samples are analyzed by scanning electron microscopy methods and corrosion rates are extrapolated from 1200 h experiments.

Item URL in elib:https://elib.dlr.de/129737/
Document Type:Article
Title:Impact of Solar Salt aging on corrosion of martensitic and austenitic steel for concentrating solar power plants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bonk, Alexanderalexander.bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Rückle, Dagmardagmar.rueckle (at) mpa.uni-stuttgart.deUNSPECIFIED
Kaesche, Stefaniestefanie.kaesche (at) mpa.uni-stuttgart.deUNSPECIFIED
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:2 September 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
Volume:203
DOI :10.1016/j.solmat.2019.110162
Page Range:pp. 110162-1
Publisher:Elsevier
ISSN:0927-0248
Status:Published
Keywords:Molten salt corrosion Nitrate salt Thermal energy storage Concentrating solar power Thermal stability
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:16 Dec 2019 16:02
Last Modified:16 Dec 2019 16:02

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