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Effect of a chromium-containing fuel additive on hot corrosionFour cast superalloys (one cobalt-base and three nickel-base) were tested at 900 C for 100 h in Mach 0.3 combustion gases. 5 ppm of synthetic sea salt were added to the gases in the combustion chamber. Several types of thermal cycle and washing procedures were employed. Similar tests were made with the addition of 300 ppm of a chromium-containing fuel additive. In both sets of tests the extent of hot corrosion was evaluated by specific weight change and metal recession. In general, the chromium additive in the fuel reduced the extent of hot (salt) corrosion but did not eliminate it. The percentage reduction of hot corrosion attack was similar for all four alloys. As great a reduction of hot corrosion was achieved by reducing the number of thermal cycles during the test from 100 to 5 or 6. The effect of washing the alloys every ten cycles as opposed to the end of the test was erratic; some alloys were attacked slightly more, others somewhat less. A NiCrAlY coating was found to be more effective in reducing hot corrosion than either the fuel additive or the washing schedule.
Document ID
19790042533
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lowell, C. E.
(NASA Lewis Research Center Cleveland, OH, United States)
Deadmore, D. L.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Publication Information
Publication: Corrosion Science
Volume: 18
Subject Category
Inorganic And Physical Chemistry
Accession Number
79A26546
Distribution Limits
Public
Copyright
Other

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