Carbon Steel and 304 SS performance in chloride solution
Carbon Steel and 304 SS performance in chloride solution
(OP)
Howdy, Eng-Tip users,
I have a de-commissioned plant that we are trying to re-use at a different site; however the new feed stream has ~2000 ppm Cl-.
The CS steel tanks will see a solution pH of ~10, while the 304SS will see ~ 3-5. The entire process will be at ambient temperature (assume 20°C).
My initial thought is that both the CS and the 304SS tanks will need a passive coating applied to them. Anyone out there with evidence to the contrary? Failing that, any recommended coatings for the CS and 304SS tanks?
Thanks in advance,
Cheers,
Brent Baker
I have a de-commissioned plant that we are trying to re-use at a different site; however the new feed stream has ~2000 ppm Cl-.
The CS steel tanks will see a solution pH of ~10, while the 304SS will see ~ 3-5. The entire process will be at ambient temperature (assume 20°C).
My initial thought is that both the CS and the 304SS tanks will need a passive coating applied to them. Anyone out there with evidence to the contrary? Failing that, any recommended coatings for the CS and 304SS tanks?
Thanks in advance,
Cheers,
Brent Baker





RE: Carbon Steel and 304 SS performance in chloride solution
Also, the corrosion issue is not limted to tanks- piping,valves, pumps etc have cossion issues as well.
RE: Carbon Steel and 304 SS performance in chloride solution
Without more info re pressure and feed stream make up, it's impossible to provide meaningful answers to your post.
RE: Carbon Steel and 304 SS performance in chloride solution
I'll try and answer some of the queries.
Pressure: the carbon steel tanks are all open top, so therefore will operate at ambient pressure. The 304SS tanks are operated under a negative pressure, sealed and vented to a scrubber.
Feed make up: Unfortunately, I don't have an ICP analysis of the feed stream. I only know it is a BLS from a gold plant. So it will contain CN, be about a pH of 9.5, and contain Cu, Ag, and Au. It shouldn't contain much Fe2+ or Fe3+.
Piping and valves: most of the piping/valving from this plant is PVC, so no worries on that front. Just interested in re-using the steel tanks.
Cheers,
Brent
RE: Carbon Steel and 304 SS performance in chloride solution
RE: Carbon Steel and 304 SS performance in chloride solution
Line the CS tanks with resin.
Don't use 304 in 2,000ppm Cl, even with liner.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube