High temperature corrosion behavior on molten nitrate salt-based nanofluids for CSP plants
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2019-01
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Abstract
Recently, a number of theoretical and experimental studies have been performed to understand the effect of nanoparticles on thermal properties and heat transfer performance but there is a lack regarding their corrosion properties. In this work, an extended corrosion characterization (at central tower plant storage temperature (565 °C)) has been carried out in two different grades of solar salt (industrial and refined purity) doped with the addition of 1 wt% Al2O3 nanoparticles or 1 wt% SiO2 nanoparticles. Corrosion rates were determined in commercial stainless steel commonly used in CSP technology (347SS) by gravimetric tests, measuring the weight gain during 1000 h, identifying the corrosion products by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The lowest corrosion rate (0.007 mm/year) was obtained in the refined solar salt with the addition of 1 wt% Al2O3 nanoparticles. A protective layer was formed in the steel-salt interphase, identified through XRD as Al2O3.
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Publisher Copyright: © 2018 Elsevier Ltd
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Nanoparticles , Molten salts , Corrosion , Concentrated solar power , Nanoparticles , Molten salts , Corrosion , Concentrated solar power , Renewable Energy, Sustainability and the Environment , SDG 7 - Affordable and Clean Energy , Funding Info , The authors would like to acknowledge the financial support_x000D_ provided by CONICYT/FONDAP 15110019 “Solar Energy Research_x000D_ Center” SERC-Chile. The authors wish to acknowledge the Univer-_x000D_ sity of the Basque Country UPV/EHU for supporting the PhD of_x000D_ Belen Munoz-Sanchez (Zabalduz program) and her research stay at_x000D_ the Universidad de Antofagasta. , The authors would like to acknowledge the financial support_x000D_ provided by CONICYT/FONDAP 15110019 “Solar Energy Research_x000D_ Center” SERC-Chile. The authors wish to acknowledge the Univer-_x000D_ sity of the Basque Country UPV/EHU for supporting the PhD of_x000D_ Belen Munoz-Sanchez (Zabalduz program) and her research stay at_x000D_ the Universidad de Antofagasta.
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Fernández , A G , Muñoz-Sánchez , B , Nieto-Maestre , J & García-Romero , A 2019 , ' High temperature corrosion behavior on molten nitrate salt-based nanofluids for CSP plants ' , Renewable Energy , vol. 130 , pp. 902-909 . https://doi.org/10.1016/j.renene.2018.07.018