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

doi:10.1016/j.surfcoat.2004.10.108

IMR OpenIR

	High-temperature oxidation and hot corrosion behaviors of the NiCr-CrAl coating on a nickel-based superalloy
	Ren, X ; Wang, FH ; Wang, X
通讯作者	Ren, X(renxin@imr.ac.cn)
	2005-08-01
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.
关键词	NiCr-CrAl coating isothermal oxidation hot corrosion sulfidation
DOI	10.1016/j.surfcoat.2004.10.108
收录类别	SCI
语种	英语
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Coatings & Films ; Physics, Applied
WOS记录号	WOS:000230419400087
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/82324
通讯作者	Ren, X
作者单位	1.Chinese Acad Sci, Met Res Inst, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China 2.Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Peoples R China 3.Liaoning Tech Univ, Dept Mat Sci & Engn, Fuxing 123000, Peoples R China
推荐引用方式 GB/T 7714	Ren, X,Wang, FH,Wang, X. 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	Ren, X,Wang, FH,&Wang, X.(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	Ren, X,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.