Trying to find some information on passivating 303 ss per 980005. We have some small screws that calls for this spec.
- Huntington, West Virginia, USA
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 [affil. link to spec at Techstreet]
ASTM A380 [link is to the practice at TechStreet]
(written before A 967, it WAS the ASTM's passivation spec), AMS2700 [affil. link to spec at Techstreet], and -AMS-QQ-P-35 [affil. link to spec at Techstreet] which is a word-for-word copy of the olde federal specification
QQ-P-35C [link is to free spec at Defense Logistics Agency, dla.mil]. 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.
metallurgist - E. Aurora, New York
Ed. note 5/29/12: That mil specs page has moved around several times over the years, but is currently at
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.John Pantzer
- Kilgore, Texas