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Update - Name that corrosion

Update - Name that corrosion

RE: Update - Name that corrosion

Where's the photo?

Monel resists reducing conditions, while the stainless steels resist oxidizing.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein

RE: Update - Name that corrosion

What about sulfur compounds (and gases) in the system?

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Update - Name that corrosion

(OP)
Not sure where the pics went...sorry. I'll post them later.

RE: Update - Name that corrosion

The combination of chlorination and Monel would rule out MIC - between the chlorine and the copper the bugs would not stand much chance. The water composition shouldn't cause too much bother to the alloy (assumed to be 400). It leaves either the NiAlBr, or the graphite, to induce galvanic corrosion. Thus, I would lean toward graphite contamination as a factor, but it's down to a proper analysis to make the call; we can't do it with pictures on the internet.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Update - Name that corrosion

Clay - did you ever do EDS and XRD as Brimstoner suggested?

Also: I had the impression that copper was as susceptible to MIC as any other alloy except titanium, and presence of chlorides in a moist environment would not kill the bugs. Steve, can you provide a reference I can look at to learn more about this?

RE: Update - Name that corrosion

It's not chlorides - it's chlorine, present from the hypochlorite treatment, i.e. disinfection. Copper is a known biocide which is why it is used in antifouling systems. However, we can theorise until the cows come home; someone has to make a decent failure analysis since the internet can't do it.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Update - Name that corrosion

Thanks Steve for the clarification. Agree with you 100% that a destructive failure analysis is really necessary to understand what really is going on.

RE: Update - Name that corrosion

(OP)
This won't warrant failure analysis as we don't use that material anymore...we're now using xm19. Galvanic seems to make the most sense given the materials nvolved. Thanks for the input.

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