Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications

Gomez-Vidal, Judith C.; Noel, John; Weber, Jacob

doi:10.1016/j.solmat.2016.07.029

Title: Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications

Abstract

Here, stainless steels (SS) 310, 321, 347, Incoloy 800H (In800H), alumina-forming austenitic (AFA-OC6), Ni superalloy Inconel 625 (IN625), and MCrAlX (M: Ni, and/or Co; X: Y, Hf, Si, and/or Ta) coatings were corroded in molten carbonates in N₂ and bone-dry CO₂ atmospheres. Electrochemical tests in molten eutectics K₂CO₃-Na₂CO₃ and Na₂CO₃-K₂CO₃-Li₂CO₃ at temperatures higher than 600 °C were evaluated using an open-circuit potential followed by a potentiodynamic polarization sweep to determine the corrosion rates. Because the best-performing alloys at 750 °C were In800H followed by SS310, these two alloys were selected as the substrate material for the MCrAlX coatings. The coatings were able to mitigate corrosion in molten carbonates environments. The corrosion of substrates SS310 and In800H was reduced from ~2500 um/year to 34 um/year when coated with high-velocity oxyfuel (HVOF) NiCoCrAlHfSiY and pre-oxidized (air, 900 °C, 24 h, 0.5 °C/min) before molten carbonate exposure at 700 °C in bone-dry CO₂ atmosphere. Metallographic characterization of the corroded surfaces showed that the formation of a uniform alumina scale during the pre-oxidation seems to protect the alloy from the molten carbonate attack.

Authors:

Gomez-Vidal, Judith C. ^[1]; Noel, John ^[1]; Weber, Jacob ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)

Publication Date:: Sat Jul 30 00:00:00 EDT 2016

Research Org.:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1301811

Alternate Identifier(s):: OSTI ID: 1359880

Report Number(s):: NREL/JA-5500-66974
Journal ID: ISSN 0927-0248

Grant/Contract Number:: AC36-08GO28308

Resource Type:: Accepted Manuscript

Journal Name:: Solar Energy Materials and Solar Cells

Additional Journal Information:: Journal Volume: 157; Journal Issue: C; Journal ID: ISSN 0927-0248

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 14 SOLAR ENERGY; 36 MATERIALS SCIENCE; molten salts; corrosion; carbonates; coating; alumina; oxidation

Citation Formats


                    Gomez-Vidal, Judith C., Noel, John, and Weber, Jacob. Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications.  United States: N. p., 2016. 
Web.  doi:10.1016/j.solmat.2016.07.029.

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                    Gomez-Vidal, Judith C., Noel, John, & Weber, Jacob. Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications.  United States.  https://doi.org/10.1016/j.solmat.2016.07.029

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                    Gomez-Vidal, Judith C., Noel, John, and Weber, Jacob. Sat .  
"Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications".  United States.  https://doi.org/10.1016/j.solmat.2016.07.029.  https://www.osti.gov/servlets/purl/1301811.

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@article{osti_1301811,

  title        = {Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications},

  author       = {Gomez-Vidal, Judith C. and Noel, John and Weber, Jacob},

  abstractNote = {Here, stainless steels (SS) 310, 321, 347, Incoloy 800H (In800H), alumina-forming austenitic (AFA-OC6), Ni superalloy Inconel 625 (IN625), and MCrAlX (M: Ni, and/or Co; X: Y, Hf, Si, and/or Ta) coatings were corroded in molten carbonates in N2 and bone-dry CO2 atmospheres. Electrochemical tests in molten eutectics K2CO3-Na2CO3 and Na2CO3-K2CO3-Li2CO3 at temperatures higher than 600 °C were evaluated using an open-circuit potential followed by a potentiodynamic polarization sweep to determine the corrosion rates. Because the best-performing alloys at 750 °C were In800H followed by SS310, these two alloys were selected as the substrate material for the MCrAlX coatings. The coatings were able to mitigate corrosion in molten carbonates environments. The corrosion of substrates SS310 and In800H was reduced from ~2500 um/year to 34 um/year when coated with high-velocity oxyfuel (HVOF) NiCoCrAlHfSiY and pre-oxidized (air, 900 °C, 24 h, 0.5 °C/min) before molten carbonate exposure at 700 °C in bone-dry CO2 atmosphere. Metallographic characterization of the corroded surfaces showed that the formation of a uniform alumina scale during the pre-oxidation seems to protect the alloy from the molten carbonate attack.},

  doi          = {10.1016/j.solmat.2016.07.029},

  journal      = {Solar Energy Materials and Solar Cells},

  number       = C,

  volume       = 157,

  place        = {United States},

  year         = {Sat Jul 30 00:00:00 EDT 2016},

  month        = {Sat Jul 30 00:00:00 EDT 2016}

}

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Works referencing / citing this record:

Review of supercritical CO 2 power cycles integrated with CSP
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Yin, Jun‐Ming; Zheng, Qiu‐Yun; Peng, Zhao‐Rui
International Journal of Energy Research
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Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al ₂ O ₃ coating deposited by high-velocity oxygen fuel thermal spraying
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Materials Research Express, Vol. 7, Issue 1
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Title: Corrosion evaluation of alloys and MCrAlX coatings in molten carbonates for thermal solar applications

Abstract

Citation Formats

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Experimental study on optimized composition of mixed carbonate salt for sensible heat storage in solar thermal power plant
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The Thermal Stability of Molten Lithium–Sodium–Potassium Carbonate and the Influence of Additives on the Melting Point
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Corrosion of Iron Stainless Steels in Molten Nitrate Salt
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Technical Challenges and Opportunities for Concentrating Solar Power With Thermal Energy Storage
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Corrosion of steels in contact with salt eutectics as latent heat storage materials: Influence of water and other impurities
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High-temperature corrosion of alumina-forming coatings for superalloys
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Preparation and hot corrosion behaviour of a MCrAlY+AlSiY composite coating
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MCrAlY coating design based on oxidation–diffusion modelling. Part II: Lifing aspects
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The role of Cr in promoting protective alumina scale formation by γ-based Ti_Al_Cr alloys—I. Compatibility with alumina and oxidation behavior in oxygen
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Hot corrosion of atomized iron aluminides doped with boron and reinforced with alumina
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Observation on the Interface of α-Al2O3/Cr2O3: Prepared by oxidation of Al45Cr7
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Thermal spray coatings for molten carbonate fuel cells separator plates
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Study of molten salt corrosion of HK-40m alloy applying linear polarization resistance and conventional weight loss techniques
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Hot corrosion behaviour of Fe–Al based intermetallic in molten NaVO3 salt
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