Stress corrosion cracking issue caused by caesium hydroxide

[emxhps06]

Hi guys

I am looking for information on SCC by caesium hydroxide at crica 300C. Does anyone know material(s) suitable for this type application?

 

[blacksmith37]

I expect the OH is the active species, so look for materials resistant to caustic; like Inconel 600.

 

[EdStainless]

Are there any halides in the solution? (even single digit ppm)
are there any oxidizing ions? (O, NO3–, Cr2O7–2, MnO4–, Fe+3, Cu+2)

Without these then a high alloy stainless (6%Mo) should be fine.
With them you need some special help.

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Plymouth Tube

 

[emxhps06]

Edstainless

Thanks for your information

There will be some methanol and demin water.

The proposed material of construction is either 304 or 316. These materials will seeing temperature as high as 300C but for no more than 72hrs (regeneratio process.

Where can I find corrosion rate information for short exposure time?

Any thoughts?

 

[EdStainless]

There are a lot of good corrosion guides out there.
Do you know dissociation coef and resulting pH for this system?

http://www.outokumpu.com/applications/corrosion/corrstart.asp

This is a good one.
Will the results be similar to NaOH?
If so then a 300 SS may not handle 300C if the pH is very high.

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Plymouth Tube

 

[Guest102023]

Treating the corrodent as if it were NaOH would be a conservative approach, NaOH being the most corrosive in the family. Using the CS<SS<Ni alloy hierarchy for increasing caustic resistance will probably result in the same alloy choice.