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topic 59554

How to passivate AISI 410 Stainless Steel at own work shop

March 7, 2014

Q. How can we passivate Needle Holder of General Surgery Material AISI-410.
Want complete Detail about Procedure in easy way.
1) Chemical percentage %
2) Time to be passivated

Also inform difference between boil test and passivation. If someone has boil test formula inform me.

Thanks in Advance.

Muhammad Nasir
Company Owner - Sialkot , Pakistan

March 2014

A. Hi cousin Nasir. The short answers are:
1). Add 20 to 40% by volume of 70% Nitric Acid to water.
2). Immerse for 30 to 60 minutes at 60 ° C.

For information on testing and verifying passivation, please see letter 4842, "Simple Passivation Test for Type 420 / 4xx / 400 Series Stainless Steel?"

But we have dozens of fairly longs threads on the passivation of stainless steel on-line here if you search the site. Obviously, if your two short questions could be properly answered in a paragraph or two, those other threads wouldn't be here :-)

You really have to start by making a decision of whether you will use nitric acid vs. citric acid vs. electropolishing for the passivation. Best of luck.


Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

March 25, 2014

A. Muhammad,
Much of what you are asking is covered merely by consulting the industry standards such as ASTM A967 / A967M [affil. link to spec at Techstreet] and ASTM F1089 [affil. link to spec at Techstreet] .

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Ray Kremer
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