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topic 59355

Single Passivation Bath for Multiple Series of Stainless Steels: 300, 400, and PH series stainless

July 19, 2013

Q. Hello,

For a Type II bath (20-25% nitric and 2-3 wt% sodium dichromate, 120-130 °F) we run 440C, 15-5PH, and 17-4PH stainless steels. We are looking into adding 301, 302, 303, 304 series as well as 410 and A286 (a PH steel).

From earlier posts, I've been reading that sulfur and manganese content may affect the process, but I haven't been able to find anything regarding the usage of multiple series of materials.

Would there be any problems having all of these materials utlitze the same bath?

Thank you in advance for your help.

Karen Gibbs
- Mount Prospect, Illinois, USA

July 26, 2013

A. No, it probably won't work for 410 because that particular breed is Martensitic. For the others it should be fine to use the same process if it's working for you now.

blake kneedler
Blake Kneedler
Feather Hollow Eng. - Stockton, California

July 30, 2013

A. We can suggest the single bath for all stainless steel types.

Contact me for more information.

Anna Berkovich
Russamer Lab
supporting advertiser 
Pittsburgh, Pennsylvania 
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July 30, 2013

A. Karen,
Properly formulated citric acid based passivation is able to handle all grades with a single bath, though for some of those grades you would also need an alkaline pretreatment bath.

Let us know if we can help.

ray kremer
Ray Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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