elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Influence of atmosphere and austenitic stainless steel on the solar salt corrosivity

Kumar, Sumit and Hanke, Andrea and Bonk, Alexander and Bauer, Thomas (2024) Influence of atmosphere and austenitic stainless steel on the solar salt corrosivity. Heliyon, 10 (4). Elsevier. doi: 10.1016/j.heliyon.2024.e25966. ISSN 2405-8440.

[img] PDF - Published version
10MB

Abstract

The utilization of the Solar Salt (60 wt%NaNO3/40 wt%KNO3) mixture as a Thermal Energy Storage (TES) medium is gaining importance due to its scalability and cost-effectiveness. However, the corrosion of metallic components presents a significant challenge. This study explores the intricate interplay between salt chemistry and its corrosivity, particularly at elevated temperatures exceeding the state-of-the-art bulk temperature 565 ◦C. The study manipulates salt decomposition by adjusting the oxygen partial pressure in the purge gas over Solar Salt and investigates the evolution of salt chemistry with and without the presence of steel. It analyzes the corrosion behavior of two types of stainless steel, AISI 316L and AISI 310, under different gas purging atmospheres. Furthermore, it employs a gold particle tracing technique to identify and monitor the formation and growth of the corrosion layer on the steel surface. The results reveal that nitrogen gas purging significantly enhances salt decomposition and its corrosivity over time. The presence of steel also influences salt decomposition depending on the purged gas atmosphere. In a nitrogen atmosphere, the presence of steel can increase the nitrite levels, while an air atmosphere results in an elevated concentration of oxide ions. In air, the AISI 310 alloy shows slightly better performance than AISI 316L. Both alloys experience substantial mass loss in the nitrogen-purged atmosphere. Interestingly, the presence of gold particles within the middle of the corrosion layer in the air purged atmosphere visually illustrates a counter diffusion involving various cations and anions across the corrosion layer.

Item URL in elib:https://elib.dlr.de/203026/
Document Type:Article
Title:Influence of atmosphere and austenitic stainless steel on the solar salt corrosivity
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kumar, SumitUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hanke, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonk, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:29 February 2024
Journal or Publication Title:Heliyon
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI:10.1016/j.heliyon.2024.e25966
Publisher:Elsevier
Series Name:Elsevier
ISSN:2405-8440
Status:Published
Keywords:Nitrate salt chemistry Thermal energy storage (TES) Concentrated solar power (CSP) Gold particle tracing Corrosion process
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Kumar, Sumit
Deposited On:29 May 2024 17:09
Last Modified:12 Jun 2024 12:52

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.