Corrosion Reaction of SS316 in Ammonia Brine

1. First, go here: How to Search the Internet Effectively
   Chemical Compatibility Database from Cole-Parmer
   
2. [PDF] Stainless Steel Chemical Resistance
   
3. [PDF] Chemical Resistance Guide - Nibco
   
4. 
   

Thank you for your attention

I know ss316 has high corrosion resistance but my intent is anodic and cathodic reactions when surface oxide layer (cr2o3) destroys.

My another question is what is happened that surface oxide layer (cr2o3) destroys with increase of CL-.

THANKS

You'll have to figure that out......

http://www.corrosion-doctors.org/Electrochemistry-of-Corrosion/Cathodic-processes.htm

http://www.corrosion-doctors.org/Electrochemistry-of-Corrosion/Surface-Area-Effect.htm

Editorial note: For chemical elements in formulas, the first letter of each element is capitalized, the second letter (if any) is lower-cased, the numerical suffix for each element is subscripted, and the numerical prefix for multiple element is left natural.

Thus: NaCl, H₂O, Na₂CO₃, and (NH₄)2CO₃. (Co = cobalt; CO = carbon and oxygen.)

Out of curiosity, what percantages of each?

Thank you,

you are right.CO = carbon and oxygen. There is'nt any Cobalt in solution.

percantages of each is:

NaCl:22%, H₂O:60.5% , Na₂CO₃:0.1% _, Na₂SO4:0.4%, NH4OH:12%, (NH4)2CO3:5%

THANKS

Hmm..., that's an interesting brine. I'm not a corrosion expert, but now that the brine has been specified, someone else may be able to help. Good luck in determining what the reactions will be!

Refer to the Cole-Parmer corrosion resistance database in #1↑. The main threat is the aqueous NaCl as the database shows only 'C-fair' to the combination 316/seawater.

GRP and naval bronze are good materials to use with seawater, from experience. Many plastics also; quantifying the temperatures is always a good thing to do with materials selection opportunities.

Another tack -

There will be equipment elsewhere on the circuit already selected to work with this ammonia brine, with the materials selections made by others. Simply use the same materials for the additional equipment. Dissimilar metals will tend to set up a corrosion cell.

The use of non-conductive materials such as natural and artificial rubber, silicones, glass, ceramics and plastics, is well worth considering.