Abstract
The formation of iron fluoride, and the friction and wear characteristics of iron on an iron frictional system were studied in a vacuum and in various gas atmospheres of different oxygen content under branched perfluoropolyether (PFPE) fluid lubrication and dry sliding. The results showed that the friction and wear with PFPE lubrication is almost independent of the dissolved oxygen content, except for high wear in the vacuum caused by the formation of intensely corrosive iron fluoride at the fresh iron surface formed by wear. Dissolved oxygen reduces the harmful fluoride formation by forming an iron oxide film. The PFPE molecules react, however, at the oxide surface to form iron fluoride, the formation of which increases with an increase in the dissolved oxygen content because of the increased formation of the iron oxide.
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