Preprint
Role of Headspace Environment for Phase Change Carbonates on the Corrosion of Stainless Steel 316l: High Temperature Thermal Storage Cycling in Concentrated Solar Power Plants
Social Science Research Network (SSRN) , Vol.28 April 2022
Elsevier
2022
Abstract
The mechanisms leading to corrosion in stainless steel containments for thermal energy storage through phase change materials, such as carbonates and chlorides, is crucial for understanding the degradation of these steel alloys. This will allow for down-selection of materials suitable for solar thermal energy storage. Samples of stainless steel 316L were subject to a cyclic heat environment of 550-750°C in air versus argon headspace environments, in the presence of a carbonate salt phase change material. A series of complementary microscopy, spectroscopy and diffractometry analytical techniques was applied to the corroded SS316L. The corrosion rate, interface formation and chemical products as a consequence of thermal cycling are presented and the degradation mechanism is explained. Corrosion is compared for different gas environments and compared for immersion into solid/liquid PCM versus exposure to PCM vapour.The study shows a higher corrosion rate of SS316L in the headspace of the containment vessel, compared to immersion in the liquid PCM. In the PCM under ambient air conditions, the steel surface was mainly corroded by the penetration of oxidants from air, such as H2O/O2 along grain boundaries. The SS316L degraded more severely with a small fraction of PCM vapour present in the air. In contrast, cycling in Ar drives less corrosion of the samples. In contrast the results suggest that corrosion in Ar is via the formation of chromite. Both mechanisms have in common that the corrosion products of Cr and Ni dissolve in the PCM thus removing any layer that could protect against corrosion.
Details
- Title
- Role of Headspace Environment for Phase Change Carbonates on the Corrosion of Stainless Steel 316l: High Temperature Thermal Storage Cycling in Concentrated Solar Power Plants
- Authors
- Yanting Yin (Author) - Flinders UniversityRaihan Rumman (Author)Madjid Sarvghad (Author) - Queensland University of TechnologyStuart Bell (Author) - Queensland University of TechnologyTeng-Cheong Ong (Author) - Queensland University of TechnologyRhys Jacob (Author) - University of South AustraliaMing Liu (Author) - University of South AustraliaRoss Flewell-Smith (Author) - University of South AustraliaShane Sheoran (Author) - University of South AustraliaJohn Severino (Author) - University of South AustraliaMartin Belusko (Author) - University of South AustraliaFrank Bruno (Author) - University of South AustraliaGeoffrey Will (Author) - Queensland University of TechnologyTed Steinberg (Author) - Queensland University of TechnologyDavid A. Lewis (Author)Gunther G. Andersson (Author) - Flinders University
- Publication details
- Social Science Research Network (SSRN) , Vol.28 April 2022
- Publisher
- Elsevier
- DOI
- 10.2139/ssrn.4093818
- ISSN
- 1556-5068
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99984953102621
- Output Type
- Preprint
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