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topic 8280

Passivation Standards


What are some industry standards for the testing of proper passivation on 316 stainless castings? I am looking for ASTM, AISI type standards to reference.

Jeff Griesenauer
- Bryan, Ohio, USA


Hello Jeff!

ASTM A967 [affil. link to spec at Techstreet] , "Chemical Passivation Treatments for Stainless Steel Parts", is probably what you want. There is also AMS2700 [affil. link to spec at Techstreet], which will eventually (when AMD Committee B gets our act together) replace AMS-QQ-P-35C [link is to free spec at Defense Logistics Agency,], the word-for-word replacement of the canceled Federal Specification QQ-P-35.

There are some tests listed in ASTM A 967, in sections 14 through 18. They list water immersion, high humidity, salt spray, copper sulfate, and potassium ferricyanide-nitric acid testing as appropriate. Just remember that a casting has a surface scale that must be removed before proper passivation can occur. If you don't get it removed, then don't be surprised if you fail any of the tests.

lee gearhart
Lee Gearhart
metallurgist - E. Aurora, New York

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