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ESCA study of oxidation and hot corrosion of nickel-base superalloysA study of the high-temperature oxidation and Na2SO4-induced hot corrosion of nickel-base superalloys has been accomplished by using ESCA to determine the surface composition of the oxidized or corroded samples. Oxidation was carried out at 900 or 1000 C in slowly flowing O2 for samples of B-1900, NASA-TRW VIA, 713C, and IN-738. Hot corrosion of B-1900 was induced by applying a coating of Na2SO4 to preoxidized samples, then heating to 900 C in slowly flowing O2. For oxidized samples, the predominant type of scale formed by each superalloy showed a marked surface enrichment of Ti. For corroded samples, the transfer of significant amounts of material from the oxide layer to the surface of the salt layer was observed before the onset of rapidly accelerating weight gain. Marked changes in surface composition coincided with the beginning of accelerating corrosion, the most striking of which were a tenfold decrease in the sulfur to sodium ratio and an increase in the Cr(VI) to Cr(III) ratio.
Document ID
19810029783
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smith, S. R.
(Case Western Reserve Univ. Cleveland, OH, United States)
Carter, W. J., III
(Case Western Reserve Univ. Cleveland, OH, United States)
Mateescu, G. D.
(Case Western Reserve University Cleveland, Ohio, United States)
Kohl, F. J.
(Case Western Reserve Univ. Cleveland, OH, United States)
Fryburg, G. C.
(Case Western Reserve Univ. Cleveland, OH, United States)
Stearns, C. A.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1980
Publication Information
Publication: Oxidation of Metals
Volume: 14
Subject Category
Metallic Materials
Accession Number
81A14187
Funding Number(s)
CONTRACT_GRANT: NSG-3009
Distribution Limits
Public
Copyright
Other

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