316 SS corrosion rates to HCL?
316 SS corrosion rates to HCL?
(OP)
Newbie here, I am trying to find out the corrosion rate in mills per year (mpy) that would occur on a 316 SS heating element that would be immersed in a 1% Hydrochloric Acid concentration in tap water. The heating element sheath temperature will be 140 F. Does anyone know of some corrosion tables or formulas that I can use to estimate this corrosion rate?
Thanks for your help in advance!
Thanks for your help in advance!





RE: 316 SS corrosion rates to HCL?
My hunch is that at that temp 316 will not be suitable.
Ti may be your only practical option.
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Plymouth Tube
RE: 316 SS corrosion rates to HCL?
We do use HCl with a high load of inibitor to clean some polished 316 SS parts at 140F. Even then with an immersion longer than 1 min we see an attack on the polished surface.
RE: 316 SS corrosion rates to HCL?
-Glenn
RE: 316 SS corrosion rates to HCL?
RE: 316 SS corrosion rates to HCL?
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316/L absolutely won't. The risk is pitting and cracking rather than uniform corrosion, so nobody will be able to give you a durability in days or weeks.
Don't forget about the attachment between the immersion heater elements and their flange...brazed joints are common and will of course be eaten for breakfast...
Local hot-spots on the element sheath are also common- and likewise will be attacked.
Your temperature is modest. Many electric heater vendors sell an element which is completely encapsulated in PFA tubing. Watt densities are low, and the element tube to "tubesheet" liner joint is vulnerable, but relative to 316 it should last forever...
RE: 316 SS corrosion rates to HCL?
RE: 316 SS corrosion rates to HCL?
TTFN
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RE: 316 SS corrosion rates to HCL?
This is the isocorrosion curve from Outokumpu for HCl and SS316L, the line for 17-12-2.5.
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As you can see @ 60°C and 1% 316 is not suitable, to high corrosion rate. You've to go for 2507 or 254 SMO or other high alloyed materials.
This is another good publications of NIDI for material selction for HCl.
"Previews of service experience plus numerous laboratory and plant corrosion tests on the performance of nickel and nickel alloys in contact with chlorine, hydrogen chloride and hydrochloric acid."
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Corrosion Resistance Data
hope this help u
S
Corrosion Prevention & Corrosion Control
RE: 316 SS corrosion rates to HCL?
Wouldn't Titanium only be good if there were oxidising ions in the HCL?