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Microstructure and hot corrosion behaviors of two Co modified aluminide coatings on a Ni-based superalloy at 700 degrees C
Q. X. Fan; S. M. Jiang; H. J. Yu; J. Gong; C. Sun
2014
Source PublicationApplied Surface Science
ISSN0169-4332
Volume311Pages:214-223
AbstractTwo Co modified aluminide coatings with different Co contents were prepared by pack cementation process and above-the-pack process. The hot corrosion tests of the two coatings were performed in mixed salts of 75 wt.% Na2SO4 + 25 wt.% K2SO4 and 75 wt.% Na2SO4 +25 wt.% NaCI at 700 degrees C, with a simple aluminide coating as the reference coating. X-Ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM) with energy dispersive X-ray spectrometer (EDS) were used to characterize the coatings and the corrosion scales. Results indicate that the addition of Co improves the hot corrosion resistance of the simple aluminide coating in the mixed sulfate salts, for the sulfide as well as its eutectic of cobalt are more stable, and possess higher melting points than those of nickel. While in the mixed salt containing chloride, the coating with medium Co content possesses the best corrosion resistance, primarily because the nitrides formed in the deposition process deteriorate the corrosion resistance of the coating with highest Co content. (C) 2014 Elsevier B.V. All rights reserved.
description.department[fan, q. x. ; jiang, s. m. ; yu, h. j. ; gong, j. ; sun, c.] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; jiang, sm (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; qxfan@imr.ac.cn ; smjiang@imr.ac.cn
KeywordAluminide Coating Pack Cementation Process Hot Corrosion Microstructure Superalloy High-temperature Corrosion Pack Cementation Process Oxidation Behavior Diffusion Coatings Al Alloys Codeposition Mechanism Si Resistance In-738lc
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73222
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Q. X. Fan,S. M. Jiang,H. J. Yu,et al. Microstructure and hot corrosion behaviors of two Co modified aluminide coatings on a Ni-based superalloy at 700 degrees C[J]. Applied Surface Science,2014,311:214-223.
APA Q. X. Fan,S. M. Jiang,H. J. Yu,J. Gong,&C. Sun.(2014).Microstructure and hot corrosion behaviors of two Co modified aluminide coatings on a Ni-based superalloy at 700 degrees C.Applied Surface Science,311,214-223.
MLA Q. X. Fan,et al."Microstructure and hot corrosion behaviors of two Co modified aluminide coatings on a Ni-based superalloy at 700 degrees C".Applied Surface Science 311(2014):214-223.
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