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topic 12410

Passivating vs annealing


 

Can I replace an annealing process for 304 stainless with a passivating process for using humidifier tanks with pure water (D.I. or R.O. water)?

Alan Garnaat
- Three Rivers, Michigan, USA


 

Alan, they do different things. Annealing removes cold work, and will make the 304 more ductile, and restore non-magnetic properties. Passivation enhances the chromium oxide layer on the surface, and cleans off any stray iron particles that can be so troublesome.

I don't know of any nitric OR citric acid passivation processes that take place at the annealing temperature (about 1950 °F). . .

Good luck!

lee gearhart
Lee Gearhart
metallurgist



 

Alan:

Lee is correct. There is no passivation process that will replace annealing. Totally different process and purpose. The passivation comes after the annealing process.

lee kremer
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Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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