Corrosion of metals and salt hydrates used for thermochemical energy storage |
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| Affiliation: | 1. GREA Innovació Concurrent, Universitat de Lleida, Edifici CREA, Pere de Cabrera s/n, 25001 Lleida, Spain;2. Department of Materials Science & Metallurgical Engineering, Universitat de Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain;1. Brookhaven National Laboratory, 2 Center Street, Upton, NY 11973, USA;2. Suffolk County Community College, 533 College Road, Selden, NY 11784, USA;3. The Renewable Energy Unit, EC Joint Research Centre, Institute for Energy and Transport, 21027 Ispra, Italy;1. Deltares, Department of Industrial Hydrodynamics, P.O. Box 177, 2600 MH Delft, The Netherlands;2. Sanitary Engineering Group, Department of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5, 2600 AA Delft, The Netherlands |
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| Abstract: | Solar energy can be efficiently used if thermal energy storage systems are accordingly designed to match availability and demand. Thermal energy storage by thermochemical materials (TCM) is very attractive since these materials present a high storage density. Therefore, compact systems can be designed to provide both heating and cooling in dwellings. One of the main drawbacks of the TCM is corrosion with metals in contact. Hence, the objective of this study is to present the obtained results of an immersion corrosion test following ASTM G1 simulating an open TCM reactor, under humidity and temperature defined conditions. Four common metals: copper, aluminum, stainless steel 316, and carbon steel, and five TCM: CaCl2, Na2S, CaO, MgSO4, and MgCl2, were studied. Aluminum and copper show severe corrosion when combined with Na2S, aluminum corrosion is more significant since the specimen was totally destroyed after 3 weeks. Stainless steel 316 is recommended to be used as a metal container material when storing all tested TCM. |
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| Keywords: | Corrosion tests Salt hydrates Metals Thermochemical materials (TCM) Thermal energy storage (TES) Building applications |
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