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Acidic attack of perfluorinated alkyl ether lubricant molecules by metal oxide surfacesThe reactions of linear perfluoropolyalkylether (PFAE) lubricants with alpha-Fe203 and Fe203-based solid superacids were studied. The reaction with alpha-Fe203 proceeds in two stages. The first stage is an initial slow catalytic decomposition of the fluid. This reaction releases reactive gaseous products which attach the metal oxide and convert it to FeF3. The second stage is a more rapid decomposition of the fluid, effected by the surface FeF3. A study of the initial breakdown step was performed using alpha-Fe203, alpha-Fe203 preconverted to FeF3, and sulfate-promoted alpha-Fe203 superacids. The results indicate that the breakdown reaction involves acidic attack at fluorine atoms on acetal carbons in the linear PFAE. Possible approaches to combat the problem are outlined.
Document ID
19910028816
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zehe, Michael J.
(NASA Lewis Research Center Cleveland, OH, United States)
Faut, Owen D.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1990
Publication Information
Publication: STLE Tribology Transactions
Volume: 33
ISSN: 0569-8197
Subject Category
Inorganic And Physical Chemistry
Accession Number
91A13439
Distribution Limits
Public
Copyright
Other

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