Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C
Next generation concentrated solar power (CSP) plants promise a higher operating temperature and better efficiency. However, new issues related to the corrosion against protection of the construction alloys need to be solved. In this work, two different duplex stainless steels grades, namely 2205 (D...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/12/2156 |
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| author | Miguel Morales Sandra Gordon Óscar Fernández-Arana Fernando García-Marro Antonio Mateo Luis Llanes Gemma Fargas |
| author_facet | Miguel Morales Sandra Gordon Óscar Fernández-Arana Fernando García-Marro Antonio Mateo Luis Llanes Gemma Fargas |
| author_sort | Miguel Morales |
| collection | DOAJ |
| description | Next generation concentrated solar power (CSP) plants promise a higher operating temperature and better efficiency. However, new issues related to the corrosion against protection of the construction alloys need to be solved. In this work, two different duplex stainless steels grades, namely 2205 (DS2205) and 2507 (DS2507), were evaluated for their compatibility with the eutectic molten salt mixture of Li<sub>2</sub>CO<sub>3</sub>-K<sub>2</sub>CO<sub>3</sub>-Na<sub>2</sub>CO<sub>3</sub> at 500 °C in air for thermal energy storage applications. Corrosion tests combined with complementary microscopy, microanalysis and mechanical techniques were employed to study the oxide scales formed on the surface of the duplex steels. The corrosion tests evidenced that the attack morphology in both duplex steels was a uniform oxidative process without localized corrosion. DS2507 presented a better corrosion resistance than DS2205, due to the formation of thinner, compact and continuous oxide layers with higher compositional content in Cr, Ni and Mo than DS2205. The oxide scales of DS2507 showed more remarkable mechanical integrity and adhesion to the metallic substrate. |
| first_indexed | 2024-03-09T16:05:50Z |
| format | Article |
| id | doaj.art-1a8861c5db364ce6a2c4a36284a30357 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:05:50Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-1a8861c5db364ce6a2c4a36284a303572023-11-24T16:41:51ZengMDPI AGMetals2075-47012022-12-011212215610.3390/met12122156Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °CMiguel Morales0Sandra Gordon1Óscar Fernández-Arana2Fernando García-Marro3Antonio Mateo4Luis Llanes5Gemma Fargas6CIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainCIEFMA, Department of Materials Science and Engineering, EEBE, Universitat Politècnica de Catalunya, UPC, C/Eduard Maristany, 10-14, 08019 Barcelona, SpainNext generation concentrated solar power (CSP) plants promise a higher operating temperature and better efficiency. However, new issues related to the corrosion against protection of the construction alloys need to be solved. In this work, two different duplex stainless steels grades, namely 2205 (DS2205) and 2507 (DS2507), were evaluated for their compatibility with the eutectic molten salt mixture of Li<sub>2</sub>CO<sub>3</sub>-K<sub>2</sub>CO<sub>3</sub>-Na<sub>2</sub>CO<sub>3</sub> at 500 °C in air for thermal energy storage applications. Corrosion tests combined with complementary microscopy, microanalysis and mechanical techniques were employed to study the oxide scales formed on the surface of the duplex steels. The corrosion tests evidenced that the attack morphology in both duplex steels was a uniform oxidative process without localized corrosion. DS2507 presented a better corrosion resistance than DS2205, due to the formation of thinner, compact and continuous oxide layers with higher compositional content in Cr, Ni and Mo than DS2205. The oxide scales of DS2507 showed more remarkable mechanical integrity and adhesion to the metallic substrate.https://www.mdpi.com/2075-4701/12/12/2156concentrated solar power (CSP)thermal energy storage (TES)molten saltsduplex stainless steeloxide scaleshigh-temperature corrosion |
| spellingShingle | Miguel Morales Sandra Gordon Óscar Fernández-Arana Fernando García-Marro Antonio Mateo Luis Llanes Gemma Fargas Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C Metals concentrated solar power (CSP) thermal energy storage (TES) molten salts duplex stainless steel oxide scales high-temperature corrosion |
| title | Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C |
| title_full | Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C |
| title_fullStr | Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C |
| title_full_unstemmed | Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C |
| title_short | Duplex Stainless Steels for Thermal Energy Storage: Characterization of Oxide Scales Formed in Carbonate Salts at 500 °C |
| title_sort | duplex stainless steels for thermal energy storage characterization of oxide scales formed in carbonate salts at 500 °c |
| topic | concentrated solar power (CSP) thermal energy storage (TES) molten salts duplex stainless steel oxide scales high-temperature corrosion |
| url | https://www.mdpi.com/2075-4701/12/12/2156 |
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