Metal finishing Q&As since 1989

Passivate 980005

Trying to find some information on passivating 303 ss per 980005. We have some small screws that calls for this spec.

Thanks.

Hello Ed!

Boy, that really sounds like some company's internal specification. So unless you can find out who wrote it, you may be spinning your wheels for awhile. I can tell you that it's not Boeing, Pratt & Whitney, GE Engines, or MacAir.

The industry wide passivation specifications on the street include ASTM A967, ASTM A380 (written before A 967, it WAS the ASTM's passivation spec), AMS2700, and -AMSQQP35 [canceled] which is a word-for-word copy of the olde federal specification QQ-P-35C [from DLA] . Of these, the QQ-P-35 is available free at assist.daps.mil. It's worth looking at if you want to know some basics of the process.

If you're stuck with 303 screws, you might consider the Type II bath, appropriate for free machining stainlesses. We have also used a Type VIII with success.

Good Luck!

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Ed. note 5/29/12: That mil specs page has moved around several times over the years, but is currently at assist.daps.dla.mil/quicksearch/
Ed. note May 2013: make that quicksearch.dla.mil

Thank you for referencing all those specs. That was very useful information as I was trying to decipher another company's passivation notes.

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