316L Passivation 1

[vanci]

Hello,
I am trying to find any and all info on the passivation of 316 SS. I would think to use Nitric and H2O but I am not sure. The end use of the product (pipe) will be for hydrogen peroxide service. Is there a standard passivation formula for 316SS regardless of application?

Also, would 316SS even be the ideal material to use?

Thanks for any and all help.

 

[israelkk]

QQ-P-35C at

http://assist.daps.dla.mil/docimages/0000/32/98/50793.PD5

 

[kenvlach]

Common materials compatible with hydrogen peroxide are aluminum (purer grades, definitely not 2024!), polyethylene and stainless. I see no reason to use 316/316L over 304/304L. Electropolishing would be beneficial.
See
material selection for 100% hydrogen peroxide @ 90°F
thread330-185282

Also, the Hydrogen Peroxide websites

http://www.h2o2.com/

&

http://oxypure.h2o2.com/productinfo/safety.html

 

[SJones]

ASTM A380 or BS 7773

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[STYMIEDPIPER]

Review the following website

http://www.delstar.com/passivating.htm

 

[strider6]

Vanci,

Regarding the resistance of 316l to Hydrogen peroxide if you look in Cor-Sur of NACE you'll find that the Corrosion rate varies between <2 to <20 mpy depending on Concentration and Temperature. So it depends on the concentration, operating parameters and design life of your plant.
Regarding the passivation i've found an interesting article on :

http://www.azom.com/details.asp?ArticleID=1142#_Passivation

and :

http://www.ssina.com/faq/index.html

Hope this help
regards

Strider

http://www.corrosionist.com

 

[STYMIEDPIPER]

Contact 'Solvay Interox' a large chemical supplier of hydrogen peroxide to the steel industry for passivation purposes. They can furnish a wealth of information regarding passivation using hydrogen peroxide.

It has been many years since I had contact with them but they were very helpful in providing information.

 

[arto]

These guys have Citric Acid passivation per ASTM A-967:

http://www.stellarsolutions.net/products/citacid.htm

More eco-friendly

 

[kenvlach]

See 'HOW TO PASSIVATE STAINLESS STEEL PARTS' by Carpenter Technology Corporation:

http://crswnew.cartech.com/wnew/techarticles/TA00042.html

 

[STYMIEDPIPER]

kenvlach

Very good article that you have referenced.

 

[EdStainless]

While we all intend for chemical passivation treatments to assist with developing a robust passive film on the material, the truth is that the only thing that you can test (non-destructively on real equipment) for is free Fe contamination. This is handy because Fe contamination is probably the leading cause of unexpected poor corrosion resistance in service.

Using stainless in peroxide is another issue. Many metals can be used for peroxide service, but system design is critical.

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Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[stanier]

Like all corrosion applications make sure that your fluid is pure. All the history in the world goes out the window if the fluid has contaminants.

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au