Rate of corrosion of 316 stainless steel in the presence of sodium hypochlorite vapors

[hondashadow1100vt]

I am looking for a source of reliable information that can be use to substantiate the rate of corrosion of 316 stainless steel in an environment that contains some gaseous phase sodium hypochlorite vapors?

The exposure to sodium hypochlorite is via vapors that have evaporated from storage tanks and containment area puddles within an enclosed room within an existing building with very poorly maintained ventilation).

Thank you. I am grateful for any responses!

 

[EdStainless]

With virtually every application for stainless steel you run into this, there is no rate of corrosion.
A rate requires some form of general corrosion. In this environment when you get failure it will be by localized pitting or crevice attack and most of the material will be untouched.
What temperature will this system see?
We must assume high humidity, so the biggest risk will be condensation in the vent lines.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[hondashadow1100vt]

EdStainless:
Approximate temperature range = 50-deg F up to 90-Deg F.
High humidity is a certainty. This building is at a water plant on the edge of a river.
Can the potential for pitting be quantified?
Do you happen to know of relevant papers or other sources of information that can offer guidance and/or experience on this subject matter?

Thanks!

 

[EdStainless]

There are many good corrosion guides out there. Some of the best papers have been published by Outokumpu.
Search their web site.
Condensation in or on these lines will assure some pitting, and cracking is a risk also. You should at lease consider using 2205. I would never hang and austenitic stainless overhead in a high Cl environment (look up swimming pool roof failures).

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[mrfailure]

I am going to send you to the ASM Handbook of Corrosion Data - 2nd Edition. All conditions noted good resistance to corrosion, but local pitting is expected. These conditions include boiling. Two conditions are reported for specific corrosion rates at elevated temperatures below boiling, but I'm not sure how applicable they are as they are also in the presence of NaOH or NaCl.

 

[hondashadow1100vt]

EdStainless:

Thank you for your note on using 2205 grade stainless. I believe that the Nickel Institute echoes that same note in a water industry specific publication in regards to enclosed plant atmospheres where chlorine vapors are present.

I will plan to check out Outokumpu's website and swimming pool roof failures based on your suggestion.

Thank you.

 

[hondashadow1100vt]

mrfailure:

Thank you for referring me to the ASM Handbook of Corrosion Data - 2nd Ed. I see that the handbook is available for me to obtain via various web sites. Given that you have nicely pointed me in the right direction, I am happy to independently follow up with the ASM manual for a first hand review of the relevant content. Thank you for pointing me in the right direction.

 

[EdStainless]

Contact Outokumpu and ask them to send a copy of their Corrosion Handbook. The front of it is a series of papers on different types of corrosion, and the back contains tables of media and alloys performance.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube