Corrosive Effects of Nitrate—Containing Phase Change Materials Used with Copper
Slovak University of Technology in Bratislava, Institute of Inorganic Chemistry, Technology and Materials, Radlinského 9, SK – 812 37 Bratislava, Slovakia
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Abstract: The paper presents the results of a study on the corrosion behaviour of copper (EN CW004A) in five possible phase change materials (PCMs): magnesium nitrate hexahydrate pure and with an addition of Mg(OH)2 (0.5 wt. %) or Sr(OH)2 (0.5 wt. %) at 90 °C, calcium nitrate tetrahydrate at 50 °C and a mixture of magnesium nitrate hexahydrate and calcium nitrate tetrahydrate (1:1 mass ratio) at 72 °C. The corrosion rate of copper samples is low except for the use of Mg(NO3)2·6H2O with/without an addition of Mg(OH)2. The lowest corrosion rate was observed for the mixture Mg(NO3)2·6H2O – Ca(NO3)2·4H2O (1:1), and it was ca six times lower than that of pure magnesium nitrate hexahydrate.
Keywords: phase change materials, latent heat storage, magnesium nitrate, calcium nitrate, copper, corrosion rate
Full paper in Portable Document Format: acs_0244.pdf
Acta Chimica Slovaca, Vol. 9, No. 2, 2016, pp. 75—83, DOI: 10.1515/acs-2016-0013