Ni-xFe合金在520℃熔融NaCl-MgCl_2中的腐蚀行为及成分优化
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摘要
为了提高太阳能储热容器的耐腐蚀性,利用重量损失法,SEM,XRD分析Ni-xFe在熔融NaCl-MgCl_2中的腐蚀行为,研究了Ni-xFe合金在520℃熔融NaCl-MgCl_2下的耐腐蚀性能,并确定出Ni-xFe合金最优的成分区间,分析了其腐蚀机理。结果表明:含Fe元素多的试样,质量损失多,表面存在较多的腐蚀孔洞,发生了严重的局部腐蚀;Ni含量较多的试样,表面的腐蚀孔洞分布均匀,质量损失较Fe含量多的试样低。说明Ni元素在Ni-xFe耐腐蚀性能方面起着有益作用。结合市场上纯Ni和纯Fe的成本因素,最终确定Ni-xFe的最佳成分区间质量分数为Ni-25%Fe。
In order to improve the corrosion resistance of solar energy heat storage vessel,The corrosion behavior of Ni-xFe in molten NaCl-MgCl_2 was analyzed by weight loss method,SEM and XRD. The corrosion resistance of Ni-xFe alloy melted at 520 ℃ NaCl-MgCl_2 was studied,and the optimum composition of Ni-xFe alloy was determined. The corrosion mechanism was analyzed. The experimental results showed that the samples with more Fe element had more mass loss,and there were more corrosion holes on the surface,which lead to serious local corrosion. In the samples with more Ni content,the corrosion holes on the surface were uniformly distributed,and the mass loss was lower than that of the samples with more Fe content,indicating that Ni was beneficial to the corrosion resistance of Ni-xFe. Combined with the cost factors of pure Ni and pure Fe in the market,the best component ratio of Ni-xFe was determined to be Ni-25 %Fe.
In order to improve the corrosion resistance of solar energy heat storage vessel,The corrosion behavior of Ni-xFe in molten NaCl-MgCl_2 was analyzed by weight loss method,SEM and XRD. The corrosion resistance of Ni-xFe alloy melted at 520 ℃ NaCl-MgCl_2 was studied,and the optimum composition of Ni-xFe alloy was determined. The corrosion mechanism was analyzed. The experimental results showed that the samples with more Fe element had more mass loss,and there were more corrosion holes on the surface,which lead to serious local corrosion. In the samples with more Ni content,the corrosion holes on the surface were uniformly distributed,and the mass loss was lower than that of the samples with more Fe content,indicating that Ni was beneficial to the corrosion resistance of Ni-xFe. Combined with the cost factors of pure Ni and pure Fe in the market,the best component ratio of Ni-xFe was determined to be Ni-25 %Fe.
引文
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[2] GIL P,JORGE O,ABDALLA,et al.Multiple regression analysis in the development of NiFe cells as energy storage solutions for intermittent power sources such as wind or solar[J].International Journal of Hydrogen Energy.2016,41(37):16330-16337.
[3] PHILIP D,MYERSD,YOGI G.Thermal energy storage using chloride salts and their eutectics[J].Applied Thermal Engineering,2016,109:889-900.
[4] LI Y Y,XU X K,WANG X X,et al.Survey and evaluation of equations for thermophysical properties of binary/ternary eutectic salts from NaCl,KCl,MgCl2 ,CaCl2 ,ZnCl2 for heat transfer and thermal storage fluids in CSP[J].Solar Energy,2017,152:57-79.
[5] WEI X L,SONG M,WANG L,et al.Design and thermal properties of a novel ternary chloride eutectics for high-temperature solar energy storage[J].Applied Energy,2015,156:306-310.
[6]MURAT M,KENISARIN.High-temperature phase change materials for thermal energy storage[J].Renewable and Sustainable Energy Reviews,2009,14(3):955-970.
[7]JUDITH C,GOMEZ V,ROBERT T.Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies[J].Solar Energy Materials and Solar Cells,2016,157:234-244.
[8] WANG J W,ZHANG C Z,LI Z H,et al,Corrosion behavior of nickel- based superalloys in thermal storage medium of molten eutectic NaCl-MgCl2 in atmosphere [J].Solar.Energy Mater and Solar.Cells.2017,164:146-155.
[9] 周红霞,王军伟.GH4033 和GH4169 合金在520 ℃熔融NaCl-52 mass% MgCl2中的腐蚀机理[J].材料热处理学报,2017,38(6):164-169.
[10] 路阳,成波,王军伟,等.不锈钢在熔融NaCl中的电化学—化学—稀释模型研究[J].材料科学与工艺,2015.23(2):75-80.
[11] RAPP R A.Chemistry and electrochemistry of the hot corrosion of metals [J].Corrosion,1986,42:568-577.
[12] 李远士,牛焱,刘刚,等.纯Fe及310不锈钢在450 ℃于ZnCl2—KCl盐膜下的腐蚀[J].金属学报,2000,36(11):1183-1186.
[13]中国钢铁工业协会委员会.腐蚀试样上腐蚀产物的清除标准:GB/T 16545—2015[S].北京:中国标准出版社,2009.
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