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Passivate 13-8 stainless with citric acid

Greetings,

I will soon have some machined 13-8 st. st. parts that need passivation in-house. I want to passivate them with citric acid and best I can tell, a 15 weight % solution may be optimum AFTER I precison clean them. Do others more versed in passivation have other suggestions or comments?

Thank you much,
Tom

Tom Hand
precision cleaning - Kansas City, Missouri
October 5, 2009

The passivation specs call out a 4-10 wt% solution. It's rather doubtful that having your bath at higher than 10% will hurt anything or contribute anything additional.

Let us know if we can help you.

Ray Kremer
Stellar Solutions, Inc.

McHenry, Illinois

October 7, 2009

October 9, 2009

Thank you for the comment. I will abide by the ASTM specification ASTM A967 and keep it below 10 weight %.

Tom

Tom Hand
precision cleaning - Kansas City, Missouri

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