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
	2007
发表期刊	High Temperature Materials and Processes
ISSN	0334-6455
卷号	26 期号:5-6 页码:377-389
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.
部门归属	[song, c.; zeng, c. l.] chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china.;zeng, cl (reprint author), chinese acad sci, state key lab corros & protect, inst met res, 62 wencui rd, shenyang 110016, peoples r china;clzeng@imr.ac.cn
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
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WOS记录号	WOS:000253701400008
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33812
专题	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.