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Problem of Brass finish burning off during sintering furnacing

Q. Good Afternoon,
My company is trying a new process, looking to get a shiny finish. We are using brass over the top of nickel on a ring, then furnacing the ring at 1550 °F in a reducing atmosphere. We start up 100% hydrogen, then switch to nitrogen for the cooling process. We are having all the brass burn off the part, and are left with a shiny appearance that looks almost like chrome. I am attempting to figure out exactly what is happening, and why my nice brass finish is disappearing.

Thank you,

Matt

Matthew Casey
- Akron Ohio
September 8, 2020

Nadcap Chemical Processing Auditor - PRI, traveling
Process Engineer / Chemist - Denver Metal Finishing, Colorado

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