Journal
RENEWABLE ENERGY
Volume 150, Issue -, Pages 428-434Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.01.001
Keywords
Sorption materials; Hydrated salts; Thermal energy storage; Corrosion
Funding
- Ministerio de Ciencia, Innovacion y Universidades de Espana [RTI2018-093849-B-C31]
- Catalan Government [2017 SGR 1537]
- ICREA under the 1CREA Academia programme
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Salt hydrates are an appealing option to be used as sorption materials in thermal energy storage (TES). In this work, strontium bromide and magnesium sulphate have been selected as one of the most promising salt hydrates since they present high energy storage density (>130 kWh/m(3)) and efficiency (>20%). One of the main drawbacks of sorption materials rely on control the hydratation-dehydratation process but there are other parameters that can modify this behaviour as the corrosive potential of these salts in contact with the container material selected for the application. Hence, four different metal container materials, specifically stainless steel, copper, aluminium, and carbon steel have been tested in SrBr2 center dot 6H(2)O and MgSO4 center dot 7H2O hydrate salts, during 100 h at dehydratation conditions. After the gravimetric and micrograph analysis carried out via scanning electron microscopy (SEM) study, only carbon steel is not recommended for this application in contact with SrBr2 center dot 6H(2)O, obtaining a corrosion rate of 0.038 mm/year, with a metallographic corrosion layer thickness of 25.2 mu m. Aluminium, copper and stainless steel showed a better corrosion resistance also in SrBr2 center dot 6H(2)O and MgSO4 center dot 7H(2)O with corrosion rates below 0.008 mm/year. (C) 2020 Elsevier Ltd. All rights reserved.
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