Corrosion evaluation of alumina-forming alloys in carbonate molten salt for CSP plants

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dc.contributor.authorFernandez, Angel G.
dc.contributor.authorPineda, Fabiola
dc.contributor.authorWalczak, Magdalena
dc.contributor.authorCabeza, Luisa F.
dc.date.accessioned2025-01-23T21:15:02Z
dc.date.available2025-01-23T21:15:02Z
dc.date.issued2019
dc.description.abstractThe use of carbonate molten salts for the new generation of concentrated solar power (CSP) plants have been considered and analysed during the last years to improve the efficiency of energy generation. However, the high temperature and corrosivity of the salts pose a risk on safety and profitability of the technology requiring more resistant materials. In this study, two alumina-forming austenitic (AFA) alloys corresponding to modified OC4 and HR224 grades, were exposed to the eutectic ternary Li2CO3-K-2-CO3-Na2CO3 (32.1-34.5-33.4 wt%) salt mixture at 650 degrees C for 1000 h. The evolution of weight change along the exposure time and analysis of the resulting scales by means of scanning electron microscopy (SEM), X-Ray diffraction (XRD), and glow discharge optical emission spectroscopy (GDOES) revealed a good performance of both steel grades associated with the formation of multi-layered corrosion products. Whereas both alloys undergo external oxidation with the formation of NiO, internal oxidation with the formation of two spinels is the case of HR224. The rate of corrosion is significantly lower than those reported in molten carbonated in non-AFA alloys, allowing to recommend OC4 and HR224 for use in the carbonate-based CSP. (C) 2019 Elsevier Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.renene.2019.03.087
dc.identifier.issn0960-1481
dc.identifier.urihttps://doi.org/10.1016/j.renene.2019.03.087
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101064
dc.identifier.wosidWOS:000466250700019
dc.language.isoen
dc.pagina.final233
dc.pagina.inicio227
dc.revistaRenewable energy
dc.rightsacceso restringido
dc.subjectCarbonate molten salts
dc.subjectCorrosion
dc.subjectAlumina-forming alloys
dc.subjectGlow discharge optical emission spectroscopy
dc.subject.ods07 Affordable and Clean Energy
dc.subject.odspa07 Energía asequible y no contaminante
dc.titleCorrosion evaluation of alumina-forming alloys in carbonate molten salt for CSP plants
dc.typeartículo
dc.volumen140
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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