NDLI: Susceptibility to hot corrosion of four nickel-base superalloys, nasa-trw via, b-1900, 713c and in-738

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Susceptibility to hot corrosion of four nickel-base superalloys, nasa-trw via, b-1900, 713c and in-738

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kohl, F. J. Fryburg, G. C. Stearns, C. A.
Copyright Year	1977
Description	The susceptibility to hot corrosion of four nickel-base, cast superalloys has been studied at 900 and 1000 C. The test consisted of coating alloy samples with known amounts of Na2SO4 and oxidizing the coated samples isothermally in 1 atmosphere of slowly flowing oxygen, the weight-gain being monitored on a sensitive recording microbalance. Susceptibility to hot corrosion decreased in the order of decreasing molybdenum content of the alloys. Preoxidation of samples before hot-corrosion testing markedly increased the induction period observed prior to the inception of hot corrosion for all alloys tested. X-ray diffraction analyses of the oxide scales were made. All samples that underwent hot corrosion showed the presence of a (Ni,Co)MoO4 layer near the alloy-oxide interface. Several specimens displayed resistance to hot corrosion and these showed NaTaO3 as a prominent feature in their oxide scale. Our results may be interpreted as indicating that molybdenum in an alloy is detrimental, with respect to hot corrosion, while tantalum is beneficial.
File Size	1095542
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19770014272
Archival Resource Key	ark:/13960/t4jm7298f
Language	English
Publisher Date	1977-04-01
Access Restriction	Open
Subject Keyword	Metallic Materials Sodium Sulfites Corrosion Resistance Nickel Alloys Hot Working Magnetic Permeability Coatings X Ray Diffraction Molybdenum Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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