Electrochemical impedance studies of molten (0.9Na,0.1K)(2)SO4-induced hot corrosion of the Ni-based superalloy M38G at 900 degrees C in air

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	Electrochemical impedance studies of molten (0.9Na,0.1K)(2)SO4-induced hot corrosion of the Ni-based superalloy M38G at 900 degrees C in air
	C. L. Zeng; J. Li
	2005
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	50 期号:28 页码:5533-5538
摘要	The hot corrosion behavior of the Ni-based superalloy M38G covered with a film of molten 0.9Na(2)SO(4)-0.1K(2)SO(4) (mole fraction) has been studied by electrochemical impedance spectroscopy at 900 degrees C in air. For comparison, the corrosion of the alloy immersed in molten (Na,K)(2)SO4 was also examined. The electrochemical impedance spectra in deep molten salt during an initial stage consisted of a semicircle at high frequency and a line at low frequency indicating a diffusion-controlled reaction. With extended immersion the impedance spectra were composed of two capacitive loops, i.e., a small semicircle at high-frequency port, and a large one at low-frequency port. The change of the impedance spectra is related to the formation of a protective scale. Contrary to the corrosion in deep molten salt, the corrosion of the alloy in the presence of a film of fused salt presented the characteristics of two capacitive loops for all the duration of the experimental test. Equivalent circuits representing the corrosion of the alloy in both corrosion conditions are proposed to fit the impedance spectra and electrochemical parameters in the equivalent circuits are also calculated. (C) 2005 Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. nanchang inst aeronaut technol, nanchang 330034, peoples r china.;zeng, cl (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;clzeng@imr.ac.cn
关键词	Ni-based Superalloy M38g (Na k)2so(4) Hot Corrosion Electrochemical Impedance Impedance Models 650 Degrees-c Preoxidized Ni Salt Corrosion Na2so4 Film Electrode Alloy
URL	查看原文
WOS记录号	WOS:000232548300007
引用统计	被引频次：31[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35191
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. L. Zeng,J. Li. Electrochemical impedance studies of molten (0.9Na,0.1K)(2)SO4-induced hot corrosion of the Ni-based superalloy M38G at 900 degrees C in air[J]. Electrochimica Acta,2005,50(28):5533-5538.
APA	C. L. Zeng,&J. Li.(2005).Electrochemical impedance studies of molten (0.9Na,0.1K)(2)SO4-induced hot corrosion of the Ni-based superalloy M38G at 900 degrees C in air.Electrochimica Acta,50(28),5533-5538.
MLA	C. L. Zeng,et al."Electrochemical impedance studies of molten (0.9Na,0.1K)(2)SO4-induced hot corrosion of the Ni-based superalloy M38G at 900 degrees C in air".Electrochimica Acta 50.28(2005):5533-5538.