Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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400 Series Passivation
Is nitric acid the preferred method of 400 series SS?
Rickey Phillipsfinishing dept. supervisor - Startanburg, South Carolina
June 23, 2008
Hi, Rickey. Nitric vs. citric has been
debated in depth several times on this site. If you put "nitric citric passivation" in the search box, you'll immediately find those many threads.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 24, 2008
July 1, 2008
Rickey,
It is perhaps best to say that nitric is an approved method in the major passivation specs (ASTM
ASTM A967,
AMS2700). Citric is of course also an approved method. The specs do not speak to a preference between the two, and that's about as close to an official industry standing on the matter as you can get.
Naturally there is nothing to stop you from evaluating both methods and coming to a personal preference.
Ray Kremer
Stellar Solutions, Inc.
McHenry, Illinois
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