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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The Advantage of Passivation, Why Do We Need to Passivate and How Is It Done?
I am working in petrochemical plant and some cooling water passivation work is now needed. I would like some information on why should we do it and the how is usually done
Thank you,
employed - Saudi
January 13, 2008
January 21, 2008
Tom,
I would start with reviewing
AMS2700 and/or SAE
AMSQQP35
[canceled]. After reviewing these documents you may be able to come back with more specific questions relating to your particular situation.
Aerospace - Yeovil, Somerset, UK
February 11, 2008
I assume you mean passivation of stainless steel.
In a nutshell, it is removing the free iron from the surface to enable the remaining chromium to form a protective, passive, chrome oxide layer, thereby resisting corrosion. This is achieved with nitric acid or, increasingly, citric acid based formulations.
Ray Kremer
Stellar Solutions, Inc.
McHenry, Illinois
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