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Letter 15068
Passivation of inconel materials
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I have a question about passivating type 625 inconel. I have a
print callout to passivate 625 inconel.
AMS-QQ-P-35 [link is to spec at TechStreet] does not
address inconel materials. It's purpose statement and tables
recommending solution type only calls out stainless steels. Are there
any detrimental effects that can result from passivating these parts.
Kevin Evers
- New Port Richey, Florida, USA
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Kevin:
I do not have any personal experience with using nitric acid with
Inconel. We cannot verify that with data on nitric, but we have had
success with proprietary formulations of citric acid. Contact us if
we can help.
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Kevin, when we have a make-to-print job telling us to passivate
any of the inconel alloys, and it's too much trouble to tell the
customer it's a worthless operation, we just do it in type 6
solution. Doesn't hurt, doesn't help, satisfies the print. Good luck!
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Lee Gearhart
metallurgist
East Aurora, NY
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Dear Reader, please --
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question on a different subject.
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- Answer or follow-up on this subject (in non-commercial
fashion).
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