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Reaction of cobalt in SO2 atmospheres at elevated temperaturesThe reaction rate of cobalt in SO2 argon environments was measured at 650 C, 700 C, 750 C and 800 C. Product scales consist primarily of an interconnected sulfide phase in an oxide matrix. At 700 C to 800 C, a thin sulfide layer adjacent to the metal is also observed. At all temperatures, the rapid diffusion of cobalt outward through the interconnected sulfide appears to be important. At 650 C, the reaction rate slows dramatically after five minutes due to a change in the distribution of these sulfides. At 700 C and 750 C, the reaction is primarily diffusion controlled; values of diffusivity of cobalt (CoS) calculated from this work show favorable agreement with values of diffusivity of cobalt (CoS) calculated from previous sulfidation work. At 800 C, a surface step becomes rate limiting. Previously announced in STAR as N83-35104
Document ID
19840050653
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jacobson, N. S.
(NASA Lewis Research Center Cleveland, OH, United States)
Worrell, W. L.
(Pennsylvania, University Philadelphia, PA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1984
Publication Information
Publication: Electrochemical Society, Journal
Volume: 131
ISSN: 0013-4651
Subject Category
Metallic Materials
Accession Number
84A33440
Funding Number(s)
CONTRACT_GRANT: NSF DMR-79-23647
Distribution Limits
Public
Copyright
Other

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