Hot corrosion of an electrodeposited Ni-11 wt % Cr nanocomposite under molten Na2SO4-K2SO4-NaCl

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	Hot corrosion of an electrodeposited Ni-11 wt % Cr nanocomposite under molten Na2SO4-K2SO4-NaCl
	C. Zhang; X. Peng; J. Zhao; F. Wang
	2005
发表期刊	Journal of the Electrochemical Society
ISSN	0013-4651
卷号	152 期号:9 页码:B321-B326
摘要	A Ni-Cr nanocomposite with an average Cr concentration of 11 (wt %) was deposited onto nickel plate by simultaneous electrodeposition of Ni and Cr nanoparticles from a nickel sulfate bath. The nanocomposite consisted of a nanocrystalline Ni matrix and dispersed Cr nanoparticles with a mean size of 33 nm. For comparison, two Ni-Cr alloys, one with similar Cr content (10 wt %) and the other with much higher Cr content (20 wt %), were prepared using electro-arc melting. Hot corrosion testing under molten Na2SO4-K2SO4-NaCl in air at 700 degrees C showed that rapid formation of a continuous chromia-rich scale is essential for hot corrosion protection. This was the case only for the nanocomposite. Internal sulfidation was observed for arc-melted alloys, but not for the nanocomposite. The results demonstrate that it was not primarily the Cr content but the unique structure of the nanocomposite that was responsible for its superior hot corrosion resistance. The protection mechanism lies in the fast formation of a continuous chromia scale on the nanocomposite, due to the easy nucleation of chromia on both chromium nanoparticles and abundant nickel grain boundaries, and then fast linking of the nuclei as a result of enhanced diffusion of Cr through those grain boundaries. (c) 2005 The Electrochemical Society.
部门归属	chinese acad sci, state key lab corros & protect, met res inst, shenyang 110016, peoples r china.;zhang, c (reprint author), chinese acad sci, state key lab corros & protect, met res inst, shenyang 110016, peoples r china;xpeng@imr.ac.cn
关键词	High-temperature Corrosion Oxidation Behavior Coatings Alloy Scale Oxides Film 800-degrees-c Sulfidation Yttrium
URL	查看原文
WOS记录号	WOS:000231066300032
引用统计	被引频次：54[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/321006/35198
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Zhang,X. Peng,J. Zhao,et al. Hot corrosion of an electrodeposited Ni-11 wt % Cr nanocomposite under molten Na2SO4-K2SO4-NaCl[J]. Journal of the Electrochemical Society,2005,152(9):B321-B326.
APA	C. Zhang,X. Peng,J. Zhao,&F. Wang.(2005).Hot corrosion of an electrodeposited Ni-11 wt % Cr nanocomposite under molten Na2SO4-K2SO4-NaCl.Journal of the Electrochemical Society,152(9),B321-B326.
MLA	C. Zhang,et al."Hot corrosion of an electrodeposited Ni-11 wt % Cr nanocomposite under molten Na2SO4-K2SO4-NaCl".Journal of the Electrochemical Society 152.9(2005):B321-B326.