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Hot corrosion studies of four nickel-base superalloys: B-1900, NASA-TRW VIA, 713C and IN738The susceptibility to hot corrosion of four nickel base superalloys has been studied at 900 deg and 1000 deg C in one atmosphere of slowly flowing oxygen. Hot corrosion was induced by coating the samples with known doses of NaSO4 and oxidizing the coated samples isothermally on a sensitive microbalance. In general, the order of susceptibility found was: B-1900 is greater than 713C is greater than NASA-TRW VIA and is greater than IN738. This order corresponds to the order of decreasing molybdenum content of the alloys. Chemical evidence for B-1900 indicates that hot corrosion is instigated by acid fluxing of the protective Al2O3 coating by MoO3.
Document ID
19770003241
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
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
September 3, 2013
Publication Date
January 1, 1976
Subject Category
Metallic Materials
Report/Patent Number
NASA-TM-X-73479
Report Number: NASA-TM-X-73479
Meeting Information
Meeting: Symp. on Properties of High Temp. Alloys
Location: Las Vegas, NV
Country: United States
Start Date: October 17, 1976
End Date: October 22, 1976
Sponsors: Met. Soc. of the Am. Inst. of Mining, Met. and Petrol. Engrs., Electrochem. Soc.
Accession Number
77N10183
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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