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Passivation of SST, epoxy and granite




I have a 304 series stainless part that has a piece of granite bonded to it using 3M Dp-190 ⇦ on eBay or Amazon [affil link] adhesive and I need to have the complete assembly passivated. I am not sure if the nitric acid will react with either the epoxy or the granite of affect the integrity of the assembly. Can someone help with the answer to this question?

Thanks,

Keith Warzecka
Precision Granite Mfg - Waite Park, MN, USA
2006


Granite is mostly silica and thus fairly resistant to acids (except HF). The 3M epoxy is unaffected by 30 days exposure to mildly acidic RMA soldering flux. Nitric acid passivation may work OK, but one test is better than 100 opinions. If problems occur, try citric acid passivation.

Ken Vlach [deceased]
- Goleta, California
contributor of the year Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
2006


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