Distinguish ASTM A967 and ASTM A380 for stainless steel passivation
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Use ASTM A380 as the practice document describing how to clean, descale, pickle, and passivate stainless steel parts — it describes procedures, not pass/fail acceptance criteria
Use ASTM A967 as the specification defining acceptable passivation treatments and the mandatory verification tests: water immersion, high humidity, salt spray, copper sulfate, potassium ferricyanide-nitric acid, and free-iron detection
Specify both together when the contract needs process guidance (A380) plus objective proof of passivation success (A967), since A380 alone has no acceptance test
Select the specific A967 passivation method (nitric acid immersion, citric acid immersion, or electrochemical) appropriate to the alloy and any masking/electronics sensitivity constraints
Run the A967-specified verification test on each lot and retain records as objective evidence of passivation, not just process compliance
Known gotchas
A380 compliance ('we followed the procedure') is not the same as A967 compliance ('we proved the result') — a customer requiring proof of passivation needs A967 testing
Citric acid vs. nitric acid immersion methods under A967 have different alloy suitability and residue characteristics — confirm the method matches the alloy and assembly sensitivities
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