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Shaun,
We analyze down to the ppm of 20 different metals that would be found in lubricating oils. I may be able to help you with this. We have many different labs that do all sorts of testing.
The item you want tested could be analyzed non-destructively where only the surface would be analyzed or it would be digested in acid and run through an ICP to determine the metal content. Are you just interested in what metal and how much? or do you want to understand the various layers?
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Michael D. Holloway
https://simple.m.wikipedia.org/wiki/Michael_D._Holloway
https://5thorderindustry.com/
https://www.amazon.com/s?k=michael+d+holloway&crid=3AWD8RUVY3E2F&sprefix= michael+d+holloway%2Caps%2C136&ref=nb_sb_noss_1
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