Citric Based Passivating Agent

[nickt1960]

I am needing to clean and passivate some significant quantities of 316 s/s on an offshore platform in the Timor Sea. The usual HF and HNO3 based pickling pastes are considered too hazardous and environmentally unfriendly to use and wash overboard. I believe there may be a citric based product which may be useful for mild levels of contamination after removal of contaminated areas with a flapper wheel or wire brush. Can anyone please advise the name of a commercially available and environmentally friendly product?

 

[kenvlach]

"CitriSurf is an environmentally friendly citric acid based cleaner and passivation product for use with all grades of stainless steel. CitriSurf replaces hazardous Nitric Acid products, and meets ASTM A-967."
Both gel and immersion versions.
Contact: Lee Kremer
E-mail: Kremer@CitriSurf.com
Phone (847) 854-2800
Fax (847) 854-2830

http://www.stellarsolutions.net/

 

[JimMetalsCeramics]

CitriSurf is supposedly a good product. Note that there are different versions. They will probably keep you from any problems with EPA or OSHA (or the equivalent out in the Timor Sea).

You might also consider vibratory burnishing.

http://metal-finishes.com/surface-preps-3.html

Other useful links:

http://www.bransonultrasonics.com/ppg/Chemistry/or-ccf.PDF

http://es.epa.gov/techpubs/0/14310.html

 

[nickt1960]

Thankyou one and all. I will follow up those suggestions