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Formation and breakdown of a protective layer of chromium sesquioxide on L-605 alloy at 1100 CThe formation and breakdown of a protective layer of Cr2O3 on the cobalt-base alloy L-605 during oxidation at 1100 C was evaluated. Deformed surface layers, pressure, and moisture were variables. Increasing surface deformation, decreasing pressure, and decreasing moisture increased time to breakdown. A model was deduced. The breakdown of the Cr2O3 layer was caused by a combination of growth stresses and volatilization. Breakdown exposed a chromium-depleted alloy to air, resulting in very rapid oxidation, which continued until consumption of the depletion zone was complete.
Document ID
19730012727
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Lowell, C. E. (NASA Lewis Research Center Cleveland, OH, United States)
Deadmore, D. L. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
April 1, 1973
Subject Category
Materials, Metallic
Report/Patent Number
NASA-TN-D-7255
E-7322
Accession Number
73N21454
Funding Number(s)
PROJECT: RTOP 501-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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