It varies a lot, depending on how much entrained/dissolved air there is, among other things.

The brine solution exposures to atmosphere and it's temprature is 60 ⁰C.

Thank you so much

It sounds as though you are using the wrong materials, Mildred. How about those new-fangled plastics instead?

% entrained or dissolved oxygen?

The answer to your question can be found at just about any shipyard or dock. Have a look around and you will see that unprotected steel parts exposed to seawater will corrode at the rate of... well, it's a pretty aggressive rate.

As Crabtree mentioned, perhaps another material selection should be considered.

Thank you Doorman

No, it is a part of chemical process of produce of soda ash.

But I just want corrosion rate of carbon steel in this situation. Please say to me a number!

Thank you