Discussion:
stainless steel 304 and brine
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Jerry Salinsky
2020-04-11 12:35:45 UTC
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Is brine corrosive to stainless steel 304? Would 304 rust in the
presence of brine?
dlzc
2020-04-11 14:55:24 UTC
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Post by Jerry Salinsky
Is brine corrosive to stainless steel 304?
Would 304 rust in the presence of brine?
Yes. But usually some amount of biology (or stirring) is required to get the reaction to proceed to mechanical failure.

The passivation (removal of free iron on the surface) of the surface will depend on how fast the first corrosion occurs. And you can add free iron to that surface just by touching it with iron tools.

Even 316L can have issues in brine. Carpenter 20 is a better, if more expensive, choice.

David A. Smith
Jerry Salinsky
2020-04-13 07:49:22 UTC
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Post by dlzc
Post by Jerry Salinsky
Is brine corrosive to stainless steel 304?
Would 304 rust in the presence of brine?
Yes. But usually some amount of biology (or stirring) is required to get the reaction to proceed to mechanical failure.
The passivation (removal of free iron on the surface) of the surface will depend on how fast the first corrosion occurs. And you can add free iron to that surface just by touching it with iron tools.
Even 316L can have issues in brine. Carpenter 20 is a better, if more expensive, choice.
David A. Smith
Thank you for the answer. What about in less concentrated salt solution,
say, 0.5%?
dlzc
2020-04-13 13:56:22 UTC
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Dear Jerry Salinsky:

On Monday, April 13, 2020 at 12:49:24 AM UTC-7, Jerry Salinsky wrote:
...
Post by Jerry Salinsky
Thank you for the answer. What about in less
concentrated salt solution, say, 0.5%?
Same song, second verse. It will just take longer to be a problem. Cast 304SS parts might seem to last forever, assuming the passivation layer stays intact.

David A. Smith
Peter Jason
2020-04-13 21:18:00 UTC
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On Sat, 11 Apr 2020 19:05:45 +0630, Jerry Salinsky
Post by Jerry Salinsky
Is brine corrosive to stainless steel 304? Would 304 rust in the
presence of brine?
Yes, especially if the SS is stressed. 316L is better though still
not suitable.
We make hypochlorite mixes in 316SS but only for the mixing. We never
store it in SS.
Use plastic if possible.

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