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

International Journal of Energy Research Pub Date : 2020-07-01 DOI:10.1002/er.5456

M. Zheng, Gaiyu Cao, Chaochao Xie

{"title":"Improvement of comprehensive properties of Na2HPO4·12H2O‐Na2SO4·10H2O hydrate composite","authors":"M. Zheng, Gaiyu Cao, Chaochao Xie","doi":"10.1002/er.5456","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":506024,"journal":{"name":"International Journal of Energy Research","volume":"76 2","pages":"7396 - 7415"},"PeriodicalIF":0.0000,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Energy Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/er.5456","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 1

Abstract

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.

查看原文本刊更多论文

改善 Na2HPO4-12H2O-Na2SO4-10H2O 水合物的综合性能

之前的研究表明，十二水磷酸氢二钠和十水硫酸钠的复合材料 Na2HPO4-12H2O: Na2SO4-10H2O = 9:1（标记为 B2）作为相变材料具有优异的性能，过冷度为 4.8°C，结晶温度为 28.2°C。本文使用无水硅酸钠（Na2SiO3-9H2O）作为成核剂添加到 B2 中，以进一步改善其性能。结果表明，在 B2 中加入 3.25% 的 Na2SiO3-9H2O 可获得 3.4°C 的最低过冷度，从而产生了一种新的最佳复合材料，命名为 C（C = B2 + 3.25% Na2SiO3-9H2O）；复合材料 C 在 200 次循环后热性能稳定，无相分离现象。此外，还对 C 熔体与 B2 熔体对铜、不锈钢和铝的腐蚀性进行了比较研究。结果表明，由于 Na2SiO3-9H2O 的抑制作用，C 熔体对铝的腐蚀最小，这与 B2 熔体的腐蚀行为有明显不同。此外，还比较研究了在 C 和 B2 中添加羧甲基纤维素（CMC）和四水铬酸钠（Na2CrO4-4H2O）的效果。实验结果表明：(a) 在 B2 中添加 1% 的 CMC 会加剧其对铝和铜的腐蚀，但对不锈钢没有影响；(b) 在 B2 中添加 1% 的 Na2CrO4-4H2O 会对铜和铝产生一定的抑制作用，但会加剧对不锈钢的腐蚀；(c) 在 C 中添加 1% 的 CMC 或 1% 的 Na2CrO4-4H2O 会提高不锈钢的耐腐蚀性；在 B2 和 C 中添加 CMC 或 Na2CrO4-4H2O 整体上不会改变它们的热特性，如过冷度和相分离。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Energy Research

自引率

0.00%

发文量