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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Passivated parts came back melted
I had a plater process A.I.S.I. 416 threaded rods to AMSQQP35 [canceled] C, Type 1. The parts came back melted. Is This the right specification for Passivate or should I use type 2?
Brian GamacheDirector Of Operations - Bolton, Connecticut, USA
April 15, 2008
April 22, 2008
Brian,
Looking at my old copy of Mil QQP35C, it directs 416 SS to be passivated with Type 2. Of course, Type 1 was removed from the C revision of QQP35.
I have another chart here, which I believe is based on a combination of those from QQP35B and QQP35C, which calls for Types 1, 2, 3, or 4 for 416 SS.
Of course, I would be remiss if I didn't point out that citric acid passivation will never etch or "melt" your parts.
The best rule, perhaps, is to use what gives you the results you want and don't use whatever gives you results you don't want.
Ray Kremer
Stellar Solutions, Inc.
McHenry, Illinois
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