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Encinas-Sánchez, V.; Batuecas, E.; Macías-García, A.; Mayo, C.; Díaz, R.; Pérez, F.J.
Solar Energy, 12/2018, Letnik: 176Journal Article
•Sol-gel ZrO2–3%molY2O3 coating deposited on P91 steel was tested in Solar Salt.•Isothermal immersion tests at 500 °C were performed for 1000 h.•The behaviour of coated P91 was directly comparable to that of the uncoated 304.•The behaviour was assessed both from a technical and environmental point of view.•Environmental benefits were obtained using P91 with ZrO2–Y2O3 compared to 304. Sol-gel ZrO2–3%molY2O3 coating deposited by means of a dip-coating application on P91 steel was statically tested at 500 °C in contact with Solar Salt (60% wt.% NaNO3/40 wt.% of KNO3) for 1000 h. This work assessed the behaviour of the coated P91 steel both from a technical and environmental point of view. Both studies were compared to those obtained with AISI 304 steel, which is currently used in commercial CSP plants. In terms of corrosion evaluation, the behaviour of the coated P91 was directly comparable to that of the uncoated AISI 304, SEM micrographs revealing the better behaviour of coated samples and the maintenance of a compact coating layer, with a thickness ranging between 1 and 1.4 μm. Furthermore, environmental analyses revealed the environmental benefits obtained by using lower Cr-Ni content steel coated with ZrO2–Y2O3 compared to AISI 304 alloy, since this coating had a negligible environmental impact (its influence is below 0.03%). Thus, the proposed scenario seems to be workable in CSP high-temperature applications both from technical and environmental points of view. The linked technical-environmental quantification provided in this paper highlights the importance of considering the whole assessment when conducting material selection for CSP applications.
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