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Ted Mooney, P.E. RET
Pine Beach, NJ
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Stainless Steel 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
2001
2001
Hello Jeff!
ASTM A967, "Chemical Passivation Treatments for Stainless Steel Parts", is probably what you want. There is also AMS2700, which will eventually (when AMD Committee B gets our act together) replace AMSQQP35 [canceled], the word-for-word replacement of the canceled Federal Specification QQ-P-35.
There are some tests listed in ASTM A967, in sections 14 through 18. They list water immersion, high humidity, salt spray, copper sulphate, and potassium_ferricyanide [affil links]-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
metallurgist - E. Aurora, New York
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