Saturated NaCl Solution
Saturated NaCl Solution
(OP)
I am looking for a recommendation for materials for long-term direct contact with saturated NaCl. While 316 is "compatabile" I am wondering about long (3-5yrs) contact. We could coat or otherwise improve the surface but the costs must be considered. Any suggestions?





RE: Saturated NaCl Solution
2) 316 SS is incompatible with saturated NaCl solution. Maybe titanium, PVC, polypropylene...
RE: Saturated NaCl Solution
The tables I have show 316 as an option but who knows for how long.
Thanks,
Alex
RE: Saturated NaCl Solution
If it isn't too hot then maybe a 6%Mo stainless would work. But given the cost and risk I would just use a C type alloy.
If it doesn't need to be metal than plastic is an even better option. You could even use a high grade amterial (PPS or PEEK) to get strength and corrosion resistance.
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RE: Saturated NaCl Solution
RE: Saturated NaCl Solution
Probably it would never need replacement, as long as there is no contact with water or excessive humidity.
RE: Saturated NaCl Solution
Surface finish and crevice corrosion were big problems with any SS
RE: Saturated NaCl Solution
I have some 316 tube that lasted less than a month in service as overhead air lines in a salt plant. The exxternal CSCC is clasic.
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RE: Saturated NaCl Solution
Would you suggest 2205?
The part is minimal loaded, we are looking for 1-2 bar differential pressure integrity only when you say 316 tube failed I am thinking you were at 5-6 bar? Was it a minimal leak or catastrophic split?
RE: Saturated NaCl Solution
The 316 that failed was from salt dust settling on the tube and then becoming wet from condensation. It was a 2 bar system. The tubing is literally coming apart.
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RE: Saturated NaCl Solution
The process used NH3 refrigeration to cool a brine solution that circulated around the cans where the block ice was formed. the large tanks we steel and cans holding the ice were galvanized. The ammonia piping was a combination of both CS and Galvanized.
RE: Saturated NaCl Solution
In a warmer system I don't think that it would hold up long enough.
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RE: Saturated NaCl Solution
What would be the upper temp limit your recommend for galvanized? Would that be better than a stainless at the same temperature range?
Thanks,
Alex
RE: Saturated NaCl Solution
You are going to need to use a high Ni alloy or a good engineered plastic.
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Rust never sleeps
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RE: Saturated NaCl Solution
I think that the traveling ice shows and some stationary ice rinks still use brine and the heat transfer medium.