2205 Stainless Steel Corrosion rate

[SteveK68]

We have a customer who uses 316L material in a 33% concentrate hydrogen peroxide chamber. The chamber and the components inside the chamber are cleaned with a chlorinated solvent. He’s having excessive pitting problems on all the components that are cleaned.

Is changing the material to 2205 SS a good solution? Is there a known corrosion rate or minimum (PREn) number with 33% concentrate hydrogen peroxide? Any help would be greatly appreciated.

Thanks,

 

[EdStainless]

The peroxide itself isn't the cause of the pitting. Residual Cl in the system is probably the cause. I recall using a mixture of HCl+ethanol+H2O2 as a macroetchant. What is the pH and temp when they are running?

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Corrosion never sleeps, but it can be managed.

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

 

[SteveK68]

The pH factor for the hydrogen peroxide @ 33% is 4.7 and the temp we run at is approximately 100 to 120 degrees. The hydrogen peroxide is in vapor state, heated to approx. 200 degs and cools to 100 degs with sterile air.

Thanks,

 

[stanweld]

As EdStainless has stated, the problem rests with your clorinated solvent cleaner and nonremoval thereof. Can you simply change to non-chlorinated solvents like acetone?

Are the degrees F or C?

 

[SteveK68]

The temp ratings are in F. I will try and get the specific chlorinated solvent our customer is using.

Thanks,