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10,000 h molten salt corrosion testing on IN617, uncoated and aluminide ferritic steels at 580 ºC

Identificadores del recurso

AIP Conference Proceeding

0094423X

https://aip.scitation.org/doi/abs/10.1063/5.0028930

http://hdl.handle.net/20.500.12666/425

10.1063/5.0028930

Procedencia

(DIGITAL.INTA)

Ficha

Título:: 10,000 h molten salt corrosion testing on IN617, uncoated and aluminide ferritic steels at 580 ºC
Tema:: Hot Corrosion; Superheaters; Scale Corrosion
Descripción:: Long term testing of two ferritic-martensitic steels (P91 and VM12-SHC) with and without slurry deposited aluminide coatings containing 20 wt.% of Al at the surface was carried out by exposing these materials to the Solar Salt, a eutectic mixture composed of 60 % NaNO3 - 40 % KNO3 at 580ºC. This salt is currently used in operating thermal solar power plants as heat transfer and storage fluid. Tubes made of expensive Ni based alloys are employed to mitigate corrosion. The tested uncoated ferritic materials exhibited very high corrosion rates developing thick, easily detached scales. IN617 was also tested as a reference and experienced very low corrosion up to 5,000 h, but after 10,000 h a 50 ȝm thick, mostly NiO scale had developed with Na0.6CoO2 crystals deposited on top. There was also evidence of significant Cr depletion at the alloy surface. Carcinogenic CrVI was found in the Solar Salt melt in which the three uncoated alloys were immersed. In contrast, the two coated ferritic steels did not show evidence of degradation after 10,000 h and the most significant microstructural change was the development of a very thin protective NaAlO2 layer on their surface. An industrial process to deposit these coatings on the inner surfaces of pipes has already been developed.; This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 686008 (RAISELIFE project). We acknowledge its support and we also thank BrightSource Industries Israel for providing the Solar Salt as well all the members of the Metallic Materials Area at INTA for technical support.
Idioma:: English
Relación:: info:eu-repo/grantAgreement/EC/H2020/686008
Autor/Productor:: Agüero, A.; Audigié, P.; Rodríguez, Sergio
Editor:: Richter C.
Otros colaboradores/productores:: European Commission (EC)
Derechos:: Attribution-NonCommercial-NoDerivatives 4.0 International; © 2020 Author(s). Published by AIP Publishing.; https://creativecommons.org/licenses/by-nc-nd/4.0/; info:eu-repo/semantics/openAccess
Fecha:: 2021-04-28T10:14:38Z; 2020-12
Tipo de recurso:: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; http://purl.org/coar/resource_type/c_c94f
Formato:: application/pdf

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1. <mods:name>
  1. <mods:namePart>Agüero, A.</mods:namePart>
  </mods:name>
2. <mods:name>
  1. <mods:namePart>Audigié, P.</mods:namePart>
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3. <mods:name>
  1. <mods:namePart>Rodríguez, Sergio</mods:namePart>
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4. <mods:extension>
  1. <mods:dateAvailable encoding="iso8601">2021-04-28T10:14:38Z</mods:dateAvailable>
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  1. <mods:dateIssued encoding="iso8601">2020-12</mods:dateIssued>
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7. <mods:identifier type="citation">AIP Conference Proceeding</mods:identifier>
8. <mods:identifier type="issn">0094423X</mods:identifier>
9. <mods:identifier type="other">https://aip.scitation.org/doi/abs/10.1063/5.0028930</mods:identifier>
10. <mods:identifier type="uri">http://hdl.handle.net/20.500.12666/425</mods:identifier>
11. <mods:identifier type="doi">10.1063/5.0028930</mods:identifier>
12. <mods:abstract>Long term testing of two ferritic-martensitic steels (P91 and VM12-SHC) with and without slurry deposited aluminide coatings containing 20 wt.% of Al at the surface was carried out by exposing these materials to the Solar Salt, a eutectic mixture composed of 60 % NaNO3 - 40 % KNO3 at 580ºC. This salt is currently used in operating thermal solar power plants as heat transfer and storage fluid. Tubes made of expensive Ni based alloys are employed to mitigate corrosion. The tested uncoated ferritic materials exhibited very high corrosion rates developing thick, easily detached scales. IN617 was also tested as a reference and experienced very low corrosion up to 5,000 h, but after 10,000 h a 50 ȝm thick, mostly NiO scale had developed with Na0.6CoO2 crystals deposited on top. There was also evidence of significant Cr depletion at the alloy surface. Carcinogenic CrVI was found in the Solar Salt melt in which the three uncoated alloys were immersed. In contrast, the two coated ferritic steels did not show evidence of degradation after 10,000 h and the most significant microstructural change was the development of a very thin protective NaAlO2 layer on their surface. An industrial process to deposit these coatings on the inner surfaces of pipes has already been developed.</mods:abstract>
13. <mods:language>
  1. <mods:languageTerm>eng</mods:languageTerm>
  </mods:language>
14. <mods:accessCondition type="useAndReproduction">© 2020 Author(s). Published by AIP Publishing.</mods:accessCondition>
15. <mods:accessCondition type="useAndReproduction">https://creativecommons.org/licenses/by-nc-nd/4.0/</mods:accessCondition>
16. <mods:accessCondition type="useAndReproduction">info:eu-repo/semantics/openAccess</mods:accessCondition>
17. <mods:accessCondition type="useAndReproduction">Attribution-NonCommercial-NoDerivatives 4.0 International</mods:accessCondition>
18. <mods:subject>
  1. <mods:topic>Hot Corrosion</mods:topic>
  </mods:subject>
19. <mods:subject>
  1. <mods:topic>Superheaters</mods:topic>
  </mods:subject>
20. <mods:subject>
  1. <mods:topic>Scale Corrosion</mods:topic>
  </mods:subject>
21. <mods:titleInfo>
  1. <mods:title>10,000 h molten salt corrosion testing on IN617, uncoated and aluminide ferritic steels at 580 ºC</mods:title>
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22. <mods:genre>info:eu-repo/semantics/article</mods:genre>
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9. <dcterms:abstract>Long term testing of two ferritic-martensitic steels (P91 and VM12-SHC) with and without slurry deposited aluminide coatings containing 20 wt.% of Al at the surface was carried out by exposing these materials to the Solar Salt, a eutectic mixture composed of 60 % NaNO3 - 40 % KNO3 at 580ºC. This salt is currently used in operating thermal solar power plants as heat transfer and storage fluid. Tubes made of expensive Ni based alloys are employed to mitigate corrosion. The tested uncoated ferritic materials exhibited very high corrosion rates developing thick, easily detached scales. IN617 was also tested as a reference and experienced very low corrosion up to 5,000 h, but after 10,000 h a 50 ȝm thick, mostly NiO scale had developed with Na0.6CoO2 crystals deposited on top. There was also evidence of significant Cr depletion at the alloy surface. Carcinogenic CrVI was found in the Solar Salt melt in which the three uncoated alloys were immersed. In contrast, the two coated ferritic steels did not show evidence of degradation after 10,000 h and the most significant microstructural change was the development of a very thin protective NaAlO2 layer on their surface. An industrial process to deposit these coatings on the inner surfaces of pipes has already been developed.</dcterms:abstract>
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  1. <dc:title>10,000 h molten salt corrosion testing on IN617, uncoated and aluminide ferritic steels at 580 ºC</dc:title>
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