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What is "White Pickling" passivating

I'm quoting a job for some thermowells made in Hast-C-276 and Duplex 2205 materials that must be "white pickled (passivated)" after machining. What exactly is "white pickling" (passivating) and how is it accomplished. The parts I'm making are solid-bored flanged thermowells with lengths around 12" long.

Any help would be appreciated.

Thank you,

Michael C [surname deleted for privacy by Editor]
- Bridgeport, Connecticut
2003

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