Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 226, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2021.111057
Keywords
Thermal energy storage; Phase-change material; Molten salt; High-temperature corrosion; Concentrating solar thermal; Electron microscopy; Corrosion mechanisms
Funding
- Australian government through the Australian Renewable Energy Agency (ARENA)
- Australian government within Australian Solar Thermal Research Initiative (ASTRI) [P51]
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Proper materialographic sample preparation is crucial in electron microscopy to achieve high-quality material results, with the use of kerosene as a lubricant showing to be the best option for analyzing molten salt corrosion phenomena.
Proper materialographic sample preparation is vital in electron microscopy to produce the best quality material results, nearest to its true structure. Environments and media such as molten salts render traditional methods inadequate for analysis. An evaluation of conventional preparation techniques with different lubricants on 316 L stainless steel from its interaction with 59.4/40.6 wt% Na2CO3/NaCl eutectic salt show how corrosion layer information is lost or retained. Additional large-scale composite electron imaging and compound analysis work on the corrosion effects of 68.05/31.95 wt% Na2SO4/NaCl was also investigated on C-276 nickel superalloy. The new adaptation of sample preparation using kerosene as a lubricant is the best available option for compound analysis of molten salt corrosion, allowing corrosion mechanisms to be more well understood. The method also provided a sample surface that allows phase mapping and compound identification to a higher degree of accuracy than previously seen in the literature.
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