Effect of Dy2O3 on the hot corrosion of Ni-based superalloy K3 beneath Na2SO4-V2O5 film at 1073K in air by electrochemical impedance spectroscopy

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	Effect of Dy2O3 on the hot corrosion of Ni-based superalloy K3 beneath Na2SO4-V2O5 film at 1073K in air by electrochemical impedance spectroscopy
	C. Song ; C. L. Zeng
刊名	High Temperature Materials and Processes
	2007
卷号	26 期号:5-6 页码:377-389
关键词	nickel-based alloy K3 Na2SO4-V2O5 Dy2O3 MgO hot corrosion electrochemical impedance spectroscopy high-temperature corrosion oil ash corrosion fuel impurities steam boilers sodium oxide solubilities inhibitor mechanism zirconia
ISSN号	0334-6455
中文摘要	This paper reports comparative investigations of the effects of Dy2O3 and MgO additives on the hot corrosion of nickel-based alloy K3 beneath Na2SO4-V2O5 film at 1073K in air by using electrochemical impedance spectroscopy. It was shown that the Dy2O3 additive could react with V2O5 to form a refractory compound DyVO4, and reduced dramatically the corrosion of the alloy due to the formation of a porous, friable deposit and of a protective Cr2O3-rich layer. Correspondingly, the electrochemical impedance spectra were composed of two capacitive loops. In contrast, the electrochemical impedance spectra for the corrosion in both Na2SO4-V2O5 and Na2SO4-MgO environments exhibited the typical features of a diffusion-controlled reaction. The MgO additive could decrease the corrosiveness of Na2SO4-V2O5 by the formation of magnesium vanadates and promoting the formation of a protective Cr-enriched scale, but with less effectiveness than the Dy2O3 additive.
原文出处	://WOS:000253701400008
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/33812]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Song,C. L. Zeng. Effect of Dy2O3 on the hot corrosion of Ni-based superalloy K3 beneath Na2SO4-V2O5 film at 1073K in air by electrochemical impedance spectroscopy[J]. High Temperature Materials and Processes,2007,26(5-6):377-389.
APA	C. Song,&C. L. Zeng.(2007).Effect of Dy2O3 on the hot corrosion of Ni-based superalloy K3 beneath Na2SO4-V2O5 film at 1073K in air by electrochemical impedance spectroscopy.High Temperature Materials and Processes,26(5-6),377-389.
MLA	C. Song,et al."Effect of Dy2O3 on the hot corrosion of Ni-based superalloy K3 beneath Na2SO4-V2O5 film at 1073K in air by electrochemical impedance spectroscopy".High Temperature Materials and Processes 26.5-6(2007):377-389.