SS's - potassium iodide 1

[jalvarez]

Hi, mates:
The limitations of SS's in aqueous chloride solutions is very known. Many threads have been written on this issue, some of them recently.
But, what are the differences with other halides solutions? The chemistry of all halides should be similar, but...
I've a case with a vessel, piping and pumps to handle a solution of potassium iodide at 1%wt. No other salts are present (demin water is used, at ambient temperature), but the use of the system will be intermittent (95% of the time the fluid will be stagnant). Is SS304 adequate?
Doing a search in this forum, I’ve found a couple of threads: thread124-59118 and thread338-89685
From the second one, it was suggested to use the following Cole-Parmer website

http://www.coleparmer.com/techinfo/ChemComp.asp

From there, the first conclusion is that 304 should be fine. My concern now is related to the stagnant conditions, as it was discussed in this forum, about chlorides.
Is there anything that would be added, colleagues?
J.Alvarez

 

[unclesyd]

304SS, better yet 304L SS, should be fine in your case if there is no Chlorides in the KI. 316 SS would be a better choice if this is a new system.

We have an extensive 304/304L piping system with all types of nook and crannies along with intermittent service that has been inservice moving both NaI and KI in all concentrations for many years. We use all welded pipe and require code welds.

 

[EdStainless]

"I" is much less agressive than Cl. At high concentrations and elevated temp you will get the same results (esp if there is any S available). Under normal condition you should be safe, but 316L would be better.

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Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm