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Chemical reactions involved in the initiation of hot corrosion of IN-738Sodium-sulfate-induced hot corrosion of preoxidized IN-738 was studied at 975 C with special emphasis placed on the processes occurring during the long induction period. Thermogravimetric tests were run for predetermined periods of time, and then one set of specimens was washed with water. Chemical analysis of the wash solutions yielded information about water soluble metal salts and residual sulfate. A second set of samples was cross sectioned dry and polished in a nonaqueous medium. Element distributions within the oxide scale were obtained from electron microprobe X-ray micrographs. Evolution of SO was monitored throughout the thermogravimetric tests. Kinetic rate studies were performed for several pertinent processes; appropriate rate constants were obtained from the following chemical reactions; Cr203 + 2 Na2S04(1) + 3/2 02 yields 2 Na2Cr04(1) + 2 S03(g)n TiO2 + Na2S04(1) yields Na20(T102)n + 503(g)n T102 + Na2Cro4(1) yields Na2(T102)n + Cr03(g).
Document ID
19850049537
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fryburg, G. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Kohl, F. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Stearns, C. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: Electrochemical Society, Journal
Volume: 131
ISSN: 0013-4651
Subject Category
Metallic Materials
Accession Number
85A31688
Distribution Limits
Public
Copyright
Other

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