Journal article
Corrosion of iron–nickel–chromium alloys in high temperature carbonate salt under argon atmosphere
Solar Energy Materials and Solar Cells, Vol.256, pp.1-10
2023
Abstract
Next generation concentrated solar thermal power can produce receiver temperatures up to 800 °C, however current solar salt based thermal storage is limited to 560 °C. Eutectic salt mixtures with high melting temperatures are potential latent heat energy storage media, and store heat in a solid-liquid phase change. This approach reduces the amount of material required, and therefore physical size of the storage system. This work investigates the compatibility of a binary eutectic mixture of 52.81 wt% K2CO3 and 47.19 wt% Na2CO3 salt with three high temperature alloys (316L, 347H and 800H) was assessed at the maximum proposed temperature of 750 °C under high purity argon cover gas.
This salt proved to be very aggressive to the alloys tested, with corrosion rates determined to be approximately 1 mm/year for the 316L and 800H alloys, and up to 10 mm/year for 347H. The corrosion product was found to consist of sodium chromite (NaCrO2) and iron and nickel oxides. After testing niobium was detected in the solidified salt in greater amounts than in the corrosion product, indicating that the niobium corrosion product was soluble in the salt. Additionally, the 800H experienced significant grain boundary oxidation, throughout the test sample.
A corrosion mechanism is proposed, based on chemical thermodynamics, which suggests that the salt will dissociate when in contact with metal at a lower temperature than previously determined. Likely corrosion reactions are discussed, and the higher corrosion rate for the niobium containing 347H was attributed to an oxygen producing reaction, which accelerates the attack on the metal.
Details
- Title
- Corrosion of iron–nickel–chromium alloys in high temperature carbonate salt under argon atmosphere
- Authors
- Stuart Bell (Corresponding Author) - Queensland University of TechnologyMadjid Sarvghad (Author) - Queensland University of TechnologyTeng-Cheong Ong (Author) - Queensland University of TechnologyDaniel Naylor (Author) - Queensland University of TechnologyXiaodong Wang (Author) - Queensland University of TechnologyYanting Yin (Author) - Flinders UniversityRaihan Rumman (Author) - Flinders UniversityGunther Andersson (Author) - Flinders UniversityGeoffrey Will (Author) - Queensland University of TechnologyDavid A. Lewis (Author) - Flinders UniversityTheodore Steinberg (Author) - Queensland University of Technology
- Publication details
- Solar Energy Materials and Solar Cells, Vol.256, pp.1-10
- Publisher
- Elsevier BV, North-Holland
- DOI
- 10.1016/j.solmat.2023.112317
- ISSN
- 1879-3398
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99737876902621
- Output Type
- Journal article
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- Domestic collaboration
- Web Of Science research areas
- Energy & Fuels
- Materials Science, Multidisciplinary
- Physics, Applied
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Source: InCites