Electrochemical Impedance Spectroscopy Studies of Corrosion of Two-phase Ni-Dy Alloys in Molten (0.62Li,0.38K)(2)CO3 at 650 degrees C

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	Electrochemical Impedance Spectroscopy Studies of Corrosion of Two-phase Ni-Dy Alloys in Molten (0.62Li,0.38K)(2)CO3 at 650 degrees C
	S. N. Liu; W. Su; W. Y. Lv; Z. F. Wei; C. L. Zeng
	2013
发表期刊	High Temperature Materials and Processes
ISSN	0334-6455
卷号	32 期号:5 页码:443-449
摘要	The dissolution of the NiO cathodes and the corrosion of bipolar plates are great obstacles to the commercialization of molten carbonate fuel cells (MCFC). Rare earth element dysprosium is effective in inhibiting the corrosion of Ni in molten carbonates. In this presentation, electrochemical impedance spectroscopy was employed to study the corrosion behavior of two-phase Ni-Dy alloys containing 1 and 3 wt.% Dy, respectively, in molten (0.62Li,0.38K)(2)CO3 at 650 degrees C in air. The experimental results indicate that the Nyquist plots for the corrosion of both Ni-1Dy and Ni-3Dy are all composed of a small capacitive loop at high frequencies and a line at low frequencies, but with larger impedance values for Ni-3Dy. The emergence of Warburg impedance at low frequencies suggests that the corrosion of alloys is controlled by the diffusion of oxidants in molten carbonates, as observed for pure nickel. The addition of dysprosium to nickel can decrease its corrosion rate, with a better effectiveness for the 3% Dy addition. Based on the diffusion impedance, the oxidants involved in corrosion are also discussed.
部门归属	[zeng, c. l.] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. [liu, s. n. ; su, w. ; lv, w. y. ; wei, z. f.] guangdong power grid corp, elect power res inst, guangzhou, guangdong, peoples r china. ; zeng, cl (reprint author), chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; clzeng@imr.ac.cn
关键词	Molten Carbonate Fuel Cell Ni-dy Alloys Corrosion Electrochemical Impedance Spectroscopy Carbonate Fuel-cells Gas Electrode-reactions Oxidation Behavior Oxygen Reduction Fe-20cr Alloys Base Alloys 0.38k)(2)Co3 Li2co3-k2co3 Dissolution Coatings
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71376
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. N. Liu,W. Su,W. Y. Lv,et al. Electrochemical Impedance Spectroscopy Studies of Corrosion of Two-phase Ni-Dy Alloys in Molten (0.62Li,0.38K)(2)CO3 at 650 degrees C[J]. High Temperature Materials and Processes,2013,32(5):443-449.
APA	S. N. Liu,W. Su,W. Y. Lv,Z. F. Wei,&C. L. Zeng.(2013).Electrochemical Impedance Spectroscopy Studies of Corrosion of Two-phase Ni-Dy Alloys in Molten (0.62Li,0.38K)(2)CO3 at 650 degrees C.High Temperature Materials and Processes,32(5),443-449.
MLA	S. N. Liu,et al."Electrochemical Impedance Spectroscopy Studies of Corrosion of Two-phase Ni-Dy Alloys in Molten (0.62Li,0.38K)(2)CO3 at 650 degrees C".High Temperature Materials and Processes 32.5(2013):443-449.