Hot corrosion behaviour of a Ni plus CrAlYSiN composite coating in Na2SO4-25 wt.% NaCl melt

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	Hot corrosion behaviour of a Ni plus CrAlYSiN composite coating in Na2SO4-25 wt.% NaCl melt
	L. J. Zhu; S. L. Zhu; F. H. Wang
	2013
发表期刊	Applied Surface Science
ISSN	0169-4332
卷号	268 页码:103-110
摘要	Ni + CrAlYSiN nanocrystalline composite coatings and NiCrAlYSi reference coatings were prepared by vacuum arc evaporation on the Ni-based K438 superalloy. The aim of this work is to identify the hot corrosion resistance of the Ni + CrAlYSiN nanocrystalline composite coatings and the NiCrAlYSi coatings. The hot corrosion tests were carried out in a molten salt (75 wt.% Na2SO4 + 25 wt.% NaCl) environment at 900 degrees C. X-Ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectrometer (EDX) and electron probe microanalysis (EPMA) technique were employed to characterize the coatings and the corrosion scales. The results indicated that both coatings improved the hot corrosion resistance of K438 in the molten salt environment. For the composite coating, the oxide scales were composed of alpha-Al2O3, Cr2O3 and minor NiCr2O4. No spallation or crack of the oxide scales was observed. Internal oxidation was detected in the outer part of the coating after 100 h corrosion. Internal TiN and AlN formation in the substrate was detected. In contrast, obvious crack/spallation of alpha-Al2O3 oxide scales on the NiCrAlYSi coating was observed; internal oxidation and sulphidation in the coating and even in the substrate were detected. (C) 2012 Elsevier B. V. All rights reserved.
部门归属	[zhu, lijuan ; zhu, shenglong ; wang, fuhui] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; zhu, sl (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china. ; slzhu@imr.ac.cn
关键词	Superalloys Aln Crn Composite Coating Hot Corrosion Metal-matrix Composites Nickel-base Superalloy Mechanical-properties Oxidation Behavior Ceramic Coatings Nicraly Coatings Resistance Deposition Alloys Nanocrystallization
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71746
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. J. Zhu,S. L. Zhu,F. H. Wang. Hot corrosion behaviour of a Ni plus CrAlYSiN composite coating in Na2SO4-25 wt.% NaCl melt[J]. Applied Surface Science,2013,268:103-110.
APA	L. J. Zhu,S. L. Zhu,&F. H. Wang.(2013).Hot corrosion behaviour of a Ni plus CrAlYSiN composite coating in Na2SO4-25 wt.% NaCl melt.Applied Surface Science,268,103-110.
MLA	L. J. Zhu,et al."Hot corrosion behaviour of a Ni plus CrAlYSiN composite coating in Na2SO4-25 wt.% NaCl melt".Applied Surface Science 268(2013):103-110.