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Black tin Oxide Deposit on Babbitt Bearings

Black tin Oxide Deposit on Babbitt Bearings

Black tin Oxide Deposit on Babbitt Bearings

(OP)
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?

RE: Black tin Oxide Deposit on Babbitt Bearings

(OP)
unclesyd - thanks I already found that one when I did a search earlier.

RE: Black tin Oxide Deposit on Babbitt Bearings

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.  

RE: Black tin Oxide Deposit on Babbitt Bearings

(OP)
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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