High-temperature corrosion behaviour of stainless steel welds in molten NaNO3-KNO3-KCl environment for concentrated solar power

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dc.contributor.authorJoy, Tony
dc.contributor.authorMori, Stefano
dc.contributor.authorSumner, Joy
dc.date.accessioned2025-03-04T10:07:45Z
dc.date.available2025-03-04T10:07:45Z
dc.date.freetoread2025-03-04
dc.date.issued2025-03-30
dc.date.pubOnline2025-02-05
dc.description.abstractThe use of fossil fuels has caused adverse effects, notably carbon emissions and climatic change. Thermal energy storage (TES) systems can be used to store energy and, when integrated with CSP, can help mitigate the intermittency of renewable sources. Higher TES working temperatures correspond to higher efficiencies which may lower costs. Various substances have been proposed as TES media; molten salts (MS) emerge as one of the most attractive options due to their stability at high temperatures. However, they can accelerate corrosion on materials, and therefore, compatibility between materials and media is crucial. Additionally, the impact of MS on welds (or welded components) has received less attention than for parent material. To address this research gap, this study compares the corrosion behaviour of plain and welded SS316L and SS304L in a mixture of 10NaNO3-78KNO3-12KCl mol% at 600 °C for up to 500 h. The samples were analysed by dimensional metrology (DM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Dimensional metrology shows a higher metal loss and sound metal loss for SS304L than SS316L. SEM micrographs showed the formation of non-adherent corrosion products on alloys surfaces. The EDS shows a selective dissolution of Fe and Cr, along with Na, K and Cl penetration into the alloy. Comparing the results, the welded areas experienced higher metal loss as compared to plain alloy samples. Another key observation was that the SS304L samples displayed lower overall corrosion resistance than SS316L.
dc.description.journalNameJournal of Energy Storage
dc.identifier.citationJoy T, Mori S, Sumner J. (2025) High-temperature corrosion behaviour of stainless steel welds in molten NaNO3-KNO3-KCl environment for concentrated solar power. Journal of Energy Storage, Volume 113, March 2025, Article number 115554en_UK
dc.identifier.eissn2352-152X
dc.identifier.elementsID564662
dc.identifier.issn2352-152X
dc.identifier.paperNo115554
dc.identifier.urihttps://doi.org/10.1016/j.est.2025.115554
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23542
dc.identifier.volumeNo113
dc.languageEnglish
dc.language.isoen
dc.publisherElsevieren_UK
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S2352152X25002671?via%3Dihub
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject40 Engineeringen_UK
dc.subject7 Affordable and Clean Energyen_UK
dc.subject13 Climate Actionen_UK
dc.subjectMolten chlorideen_UK
dc.subjectHigh temperature corrosionen_UK
dc.subjectStainless steelsen_UK
dc.subjectDimensional metrologyen_UK
dc.subjectThermal energy storageen_UK
dc.subjectScanning electron microscopyen_UK
dc.titleHigh-temperature corrosion behaviour of stainless steel welds in molten NaNO3-KNO3-KCl environment for concentrated solar poweren_UK
dc.typeArticle
dc.type.subtypeJournal Article
dcterms.dateAccepted2025-01-23

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