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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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QQ-P-35 Type 2 vs MIL-S-5002
Q. I work for a job shop and we don't do any finishing ourselves but use vendors for the finishing process.
One of our customers was recently purchased by an large aerospace company and they changed the specification for passivization of 303 CRES from QQ-P-35 Type 2 to MIL-S-5002 Type II.
What are the differences between the specifications and can parts that have already been processed to the QQ-P-35 specification be reprocessed to the MIL-S-5002 specification?
job shop - Los Angeles, California, USA
October 4, 2008
A. Dale,
Mil specs are freely available for download from http://assist.daps.dla.mil/quicksearch/
The paragraph in S-5002 about passivation basically says to use QQ-P-35.
I would also like to point out here that QQ-P-35 is a canceled spec, and itself automatically refers to
AMS2700 for aerospace and ASTM A967 for other industries. There is also essentially no difference between the replacement specs and QQ-P-35 as far as nitric acid processes are concerned, but allowance for citric acid processes have been added.
Ray Kremer
Stellar Solutions, Inc.
McHenry, Illinois
October 7, 2008
Thank you Ray Kremer for your prompt response and for the link to the documents. And thanks to finishing.com as well.
- Los Angeles, California, USA
October 10, 2008
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