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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
Source PublicationHigh Temperature Materials and Processes
ISSN0334-6455
Volume32Issue:5Pages:443-449
AbstractThe 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.
description.department[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
KeywordMolten 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
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71376
Collection中国科学院金属研究所
Recommended Citation
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.
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