期刊
SURFACE & COATINGS TECHNOLOGY
卷 203, 期 8, 页码 1004-1013出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2008.09.031
关键词
Superalloys; Hot corrosion; Cr3C2-NiCr coating; Detonation gun; Microstructural characterizations
In the present investigation, Cr3C2-NiCr cermet coatings were deposited on two Ni-based superalloys. namely superni 75, superni 718 and one Fe-based superalloy superfer 800H by detonation-gun thermal spray process. The cyclic hot-corrosion studies were conducted on uncoated as well as D-gun coated superalloys in the presence of mixture of 75 wt.% Na2SO4 + 25 wt.% K2SO4 film at 900 degrees C for 100 cycles. Thermogravimetric technique was used to establish the kinetics of hot corrosion of uncoated and coated superalloys. X-ray diffraction, FE-SEM/EDAX and X-ray mapping techniques were used to analyze the corrosion products for rendering an insight into the corrosion mechanisms. It was observed that Cr3C2-NiCr-coated superalloys showed better hot-corrosion resistance than the uncoated superalloys in the presence of 75 wt.% Na2SO4 + 25 wt.% K2SO4 film as a result of the formation of continuous and protective oxides of chromium. nickel and their spinel, as evident from the XRD analysis. (C) 2008 Elsevier B.V. All rights reserved.
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