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.

中文翻译：

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Na2HPO4·12H2O-Na2SO4·10H2O水合物复合材料综合性能的改善

先前的研究表明，磷酸二氢钠十二水合物和硫酸钠十水合物在Na ₂ HPO ₄ ·12H ₂ O：Na ₂ SO ₄ ·10H ₂ O = 9：1（标记为B ₂）的复合材料中表现出优良的相变材料性能过冷度为4.8°C，结晶温度为28.2°C。本文以硅酸钠九水合物（Na ₂ SiO ₃ ·9H ₂ O）为成核剂添加到B _2中，以进一步改善其性能。结果表明，通过添加3.25％的Na ₂ SiO可以获得最低的3.4°C过冷度。₃ ·9H ₂ O到B ₂，从而生成标记为C的新的最佳复合材料（C = B ₂ + 3.25％Na ₂ SiO ₃ ·9H ₂ O）；复合材料C在200次循环后具有稳定的热性能，没有相分离。此外，与熔体B _2相比，研究了熔体C对铜，不锈钢和铝的腐蚀。这表明，由于Na ₂ SiO ₃ ·9H ₂ O的抑制作用，熔体C对铝的腐蚀最小，这与熔体B ₂的腐蚀行为不同。显着。另外，比较研究了羧甲基纤维素（CMC）和铬酸钠四水合物（Na ₂ CrO ₄ ·4H ₂ O）对C和B ₂的添加效果。实验结果表明，（a）在B _2中添加1％CMC会加剧其对铝和铜的腐蚀，但对不锈钢无影响；（b）在B _2中添加1％Na ₂ CrO ₄ ·4H ₂ O会引起腐蚀。对铜和铝有一定的抑制作用，但加剧了对不锈钢的腐蚀（c）添加1％CMC或1％Na ₂ CrO ₄ ·4H ₂O到C改善了不锈钢的耐腐蚀性；向B ₂和C中添加CMC或Na ₂ CrO ₄ ·4H ₂ O总体上不会改变它们的热特性，例如过冷和相分离。