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

Journal Article · Sat Jul 30 00:00:00 EDT 2016 · Solar Energy Materials and Solar Cells

DOI:https://doi.org/10.1016/j.solmat.2016.07.029· OSTI ID:1301811

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

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

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.

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

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

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1301811

Alternate ID(s):: OSTI ID: 1359880

Report Number(s):: NREL/JA-5500-66974

Journal Information:: Solar Energy Materials and Solar Cells, Vol. 157, Issue C; ISSN 0927-0248

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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

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