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Black tin Oxide Deposit on Babbitt Bearings

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Carburize

Materials
Sep 23, 2002
702
Does anybody have any references to any research work or investigations on the causes and effects of the black tin-oxide deposits frequently found on small areas of the surface of babbitted bearings?
 
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unclesyd - thanks I already found that one when I did a search earlier.
 
I have two other articles that say essentially the same thing.

I have seen this problem on several babbitt bearings where there was water, not saltwater, present. These bearings were in turbines and centrifugal compressors. Two of the instances were on a popular make air compressor where the steam turbine is directly coupled to the compressor and share a common oil sump. As you probably know we get steam/condensate by the carbons and into the oil. The water has a Ph 5-6 and thoroughly oxygenated. We don't see this on every turnaround but about a quarter of the time. These machines have been running this way for 25 years.
 
I see the effect quite a lot on dry units and it appears to be largely a function of fretting damage during transport.
 
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