High-temperature oxidation and hot corrosion behaviors of the NiCr-CrAl coating on a nickel-based superalloy

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	High-temperature oxidation and hot corrosion behaviors of the NiCr-CrAl coating on a nickel-based superalloy
	X. Ren; F. H. Wang; X. Wang
	2005
发表期刊	Surface & Coatings Technology
ISSN	0257-8972
卷号	198 期号:1-3 页码:425-431
摘要	The hot-section components in commercial aerogas turbines were typically made of nickel-based superalloys and were protected by coatings. Two kinds of diffusion aluminide coatings, including simple aluminide coating and NiCr-CrAl coating, were prepared on a nickel-based cast superalloy by LP-VCD and pack cementation techniques, respectively. The isothermal oxidation behavior of the cast alloy and the coatings at 1000 and 1100 degrees C and their hot corrosion behaviors in the presence of 75 wt.% Na2SO4+K2SO4 film at 900 degrees C were studied using TGA, scanning electron microscopy (SEM)/energy-dispersive spectrometry (EDS), X-ray diffraction (XRD) and electron probe microanalysis (EPMA), respectively. The results showed that NiCr-CrAl coating, not only held a very excellent oxidation resistance due to the alpha-Al2O3 formation on the coating surface during the isothermal process at 1000 and 1100 degrees C, but also possessed excellent hot corrosion resistance in sulphate melt. Internal oxidation and nitridation were found in the cast alloy during the oxidation process. Moreover, the cast alloy suffered from catastrophic hot corrosion, resulting in the serious internal oxidation and sulfidation. The oxidation resistance of the simple aluminide coating was superior to the cast alloy; the simple aluminide coating was damaged completely and lost its protective effect after the hot corrosion test. In addition, the mechanisms for oxidation and corrosion of the cast alloy and the coatings are discussed simultaneously. (c) 2004 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, met res inst, state key lab corros & protect, shenyang 110016, peoples r china. nanjing univ sci & technol, sch chem engn, nanjing 210094, peoples r china. liaoning tech univ, dept mat sci & engn, fuxing 123000, peoples r china.;ren, x (reprint author), chinese acad sci, met res inst, state key lab corros & protect, shenyang 110016, peoples r china;renxin@imr.ac.cn
关键词	Nicr-cral Coating Isothermal Oxidation Hot Corrosion Sulfidation Diffusion Aluminide Coatings Protective Coatings Cyclic Oxidation Resistance Alloys Co Chromium Al Ti
URL	查看原文
WOS记录号	WOS:000230419400087
引用统计	被引频次：41[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/321006/35021
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Ren,F. H. Wang,X. Wang. High-temperature oxidation and hot corrosion behaviors of the NiCr-CrAl coating on a nickel-based superalloy[J]. Surface & Coatings Technology,2005,198(1-3):425-431.
APA	X. Ren,F. H. Wang,&X. Wang.(2005).High-temperature oxidation and hot corrosion behaviors of the NiCr-CrAl coating on a nickel-based superalloy.Surface & Coatings Technology,198(1-3),425-431.
MLA	X. Ren,et al."High-temperature oxidation and hot corrosion behaviors of the NiCr-CrAl coating on a nickel-based superalloy".Surface & Coatings Technology 198.1-3(2005):425-431.