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Improvement of comprehensive properties of Na2HPO4·12H2O‐Na2SO4·10H2O hydrate composite

Previous study indicated that the composite of disodium hydrogen phosphate dodecahydrate and sodium sulfate decahydrate at Na2HPO4·12H2O: Na2SO4·10H2O = 9:1 (labeled as B2) exhibits excellent properties as phase change material with supercooling of 4.8°C and crystallization temperature of 28.2°C. In this paper, sodium silicate nonahydrate (Na2SiO3·9H2O) is used as nucleating agent to add to B2 to improve its properties further. It showed that the lowest supercooling of 3.4°C could be obtained by addition of 3.25% Na2SiO3·9H2O to B2, thus it produces a new optimal composite labeled as C (C = B2 + 3.25% Na2SiO3·9H2O); the composite material C has stable thermal performance after 200 cycles with no phase separation. Furthermore, the corrosion of melt C to copper, stainless steel and aluminum is studied comparatively with melt B2. It indicates that melt C has the least corrosion to aluminum due to the inhibition effect of Na2SiO3·9H2O, which differs from that of the corrosion behavior of melt B2 significantly. Moreover, the effects of carboxymethyl cellulose (CMC) and sodium chromate tetrahydrate (Na2CrO4·4H2O) additions to C and B2 are studied comparatively. Experimental results present that (a) addition of 1% CMC to B2 aggravates its corrosion to aluminum and copper, but no effect on stainless steel, (b) addition of 1% Na2CrO4·4H2O to B2 induces a certain inhibition effect on copper and aluminum, but intensifies the corrosion on stainless steel (c) addition of 1% CMC or 1% Na2CrO4·4H2O to C improves the corrosion resistance of stainless steel; addition of CMC or Na2CrO4·4H2O to B2 and C does not change their thermal characteristics, such as supercooling and phase separation, on the whole.