Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems
Dual-phase high entropy alloys have recently attracted widespread attention as advanced structural materials due to their unique microstructure, excellent mechanical properties, and corrosion resistance. However, their molten salt corrosion behavior has not been reported, which is critical in evalua...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/25/2/296 |
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| author | Kunjal Patel Vahid Hasannaeimi Maryam Sadeghilaridjani Saideep Muskeri Chaitanya Mahajan Sundeep Mukherjee |
| author_facet | Kunjal Patel Vahid Hasannaeimi Maryam Sadeghilaridjani Saideep Muskeri Chaitanya Mahajan Sundeep Mukherjee |
| author_sort | Kunjal Patel |
| collection | DOAJ |
| description | Dual-phase high entropy alloys have recently attracted widespread attention as advanced structural materials due to their unique microstructure, excellent mechanical properties, and corrosion resistance. However, their molten salt corrosion behavior has not been reported, which is critical in evaluating their application merit in the areas of concentrating solar power and nuclear energy. Here, the molten salt corrosion behavior of AlCoCrFeNi<sub>2.1</sub> eutectic high-entropy alloy (EHEA) was evaluated in molten NaCl-KCl-MgCl<sub>2</sub> salt at 450 °C and 650 °C in comparison to conventional duplex stainless steel 2205 (DS2205). The EHEA showed a significantly lower corrosion rate of ~1 mm/year at 450 °C compared to ~8 mm/year for DS2205. Similarly, EHEA showed a lower corrosion rate of ~9 mm/year at 650 °C compared to ~20 mm/year for DS2205. There was selective dissolution of the body-centered cubic phase in both the alloys, B2 in AlCoCrFeNi<sub>2.1</sub> and α-Ferrite in DS2205. This was attributed to micro-galvanic coupling between the two phases in each alloy that was measured in terms of Volta potential difference using a scanning kelvin probe. Additionally, the work function increased with increasing temperature for AlCoCrFeNi<sub>2.1,</sub> indicating that the FCC-L1<sub>2</sub> phase acted as a barrier against further oxidation and protected the underlying BCC-B2 phase with enrichment of noble elements in the protective surface layer. |
| first_indexed | 2024-03-11T08:52:02Z |
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| id | doaj.art-9cfc4b911d574560b9ad6f8605c724ac |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-11T08:52:02Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-9cfc4b911d574560b9ad6f8605c724ac2023-11-16T20:23:33ZengMDPI AGEntropy1099-43002023-02-0125229610.3390/e25020296Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power SystemsKunjal Patel0Vahid Hasannaeimi1Maryam Sadeghilaridjani2Saideep Muskeri3Chaitanya Mahajan4Sundeep Mukherjee5Department of Material Science and Engineering, University of North Texas, Denton, TX 76203, USADepartment of Material Science and Engineering, University of North Texas, Denton, TX 76203, USADepartment of Material Science and Engineering, University of North Texas, Denton, TX 76203, USADepartment of Material Science and Engineering, University of North Texas, Denton, TX 76203, USADepartment of Material Science and Engineering, University of North Texas, Denton, TX 76203, USADepartment of Material Science and Engineering, University of North Texas, Denton, TX 76203, USADual-phase high entropy alloys have recently attracted widespread attention as advanced structural materials due to their unique microstructure, excellent mechanical properties, and corrosion resistance. However, their molten salt corrosion behavior has not been reported, which is critical in evaluating their application merit in the areas of concentrating solar power and nuclear energy. Here, the molten salt corrosion behavior of AlCoCrFeNi<sub>2.1</sub> eutectic high-entropy alloy (EHEA) was evaluated in molten NaCl-KCl-MgCl<sub>2</sub> salt at 450 °C and 650 °C in comparison to conventional duplex stainless steel 2205 (DS2205). The EHEA showed a significantly lower corrosion rate of ~1 mm/year at 450 °C compared to ~8 mm/year for DS2205. Similarly, EHEA showed a lower corrosion rate of ~9 mm/year at 650 °C compared to ~20 mm/year for DS2205. There was selective dissolution of the body-centered cubic phase in both the alloys, B2 in AlCoCrFeNi<sub>2.1</sub> and α-Ferrite in DS2205. This was attributed to micro-galvanic coupling between the two phases in each alloy that was measured in terms of Volta potential difference using a scanning kelvin probe. Additionally, the work function increased with increasing temperature for AlCoCrFeNi<sub>2.1,</sub> indicating that the FCC-L1<sub>2</sub> phase acted as a barrier against further oxidation and protected the underlying BCC-B2 phase with enrichment of noble elements in the protective surface layer.https://www.mdpi.com/1099-4300/25/2/296molten salt corrosionscanning kelvin probe (SKP)work functiongalvanic corrosionhigh entropy alloydual-phase alloy |
| spellingShingle | Kunjal Patel Vahid Hasannaeimi Maryam Sadeghilaridjani Saideep Muskeri Chaitanya Mahajan Sundeep Mukherjee Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems Entropy molten salt corrosion scanning kelvin probe (SKP) work function galvanic corrosion high entropy alloy dual-phase alloy |
| title | Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems |
| title_full | Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems |
| title_fullStr | Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems |
| title_full_unstemmed | Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems |
| title_short | Molten Salt Corrosion Behavior of Dual-Phase High Entropy Alloy for Concentrating Solar Power Systems |
| title_sort | molten salt corrosion behavior of dual phase high entropy alloy for concentrating solar power systems |
| topic | molten salt corrosion scanning kelvin probe (SKP) work function galvanic corrosion high entropy alloy dual-phase alloy |
| url | https://www.mdpi.com/1099-4300/25/2/296 |
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