More tetrabromoethane questions

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Discussion Overview

The discussion revolves around the reactivity of tetrabromoethane with active metals, specifically aluminum, and the potential impact of anodizing on aluminum surfaces. Participants explore the chemical's corrosive properties, safety concerns, and the implications of using anodized aluminum in environments where tetrabromoethane is present.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether hard coat anodizing on aluminum would prevent reactions with tetrabromoethane, noting that it reacts with active metals.
  • Another participant suggests that anodizing would help, speculating that HBr in the vapor might be the primary corrosive element.
  • A different participant raises concerns about the safety of aluminum in contact with alkyl halides, mentioning the potential for explosive reactions and the need for small-scale testing before larger applications.
  • There is a discussion about the meaning of "dry" aluminum in the context of incident reports, with one participant clarifying that it refers to aluminum that is no longer wetted by solvent.
  • Another participant expresses uncertainty about whether the liquid or vapor of tetrabromoethane is more corrosive, suggesting that the liquid appears to be the bigger problem based on observations from a tank.

Areas of Agreement / Disagreement

Participants express differing views on the corrosive effects of tetrabromoethane and the effectiveness of anodizing aluminum, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Participants note limitations in their understanding of the mechanisms involved, the specific conditions under which reactions may occur, and the definitions of terms like "dry" aluminum.

wxrocks
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I didn't get much on my last one -- but here's a different question regarding this chemical ...

I know this stuff reacts with active metals -- it says keep away from Mg, Brass and Aluminum -- but I am wondering if a hard coat anodizing on aluminum would prevent this reaction. Any ideas??

Eric
 
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It would definitely help. I suspect the primary corrosive element is the little bit of HBr in the vapor.

I'll look around a little bit and see if I have something among my bookmarks.
 
thanks

thanks for the reply -- and I hope you can find more info on this stuff. Its interesting how this simple chemical can be so nasty!
 
Hit the fire codes, NFPR, and you might find something. Al plus alkyl halides (maybe minus F) make for impact sensitive situations. Never tracked down any details about mechanisms, weathered, anodized, bright Al surfaces, or any other pertinent details; aluminum oxide is an adsorbent surface far as alkyl halides go, anodized aluminum surfaces are microfissured (unless steamed, and still remain somewhat fissured), so the anodizing might actually aggravate the hazard.

My suspicion is that the primary reactive hazard is formation of AlX3, or mixed AlOX --- given that NFPR has incident reports of detonations on "dry" Al surfaces that have been exposed to "perc," "trike," MeCl2, and other chlorinated solvents, and from personal experience with the facility of "double replacement reactions" of MX with Al2O3, you might be a lot happier to run some very small scale tests in a hood before committing yourself to anything on a large scale.
 
wxrocks said:
I didn't get much on my last one -- but here's a different question regarding this chemical ...

I know this stuff reacts with active metals -- it says keep away from Mg, Brass and Aluminum -- but I am wondering if a hard coat anodizing on aluminum would prevent this reaction. Any ideas??

Eric
Reading Bystander's post, I have to ask this: are you worried about corrosion from direct contact or exposure to vapor?

Also, Bystander, I've used methylene chloride on aluminum parts without too much trouble (mostly to dissolve an epoxy). So, what does NFPR mean by "dry" aluminum?
 
Last edited:
"Dry" far as the "incident report" (pun intended) meant that the solvent had "totally" evaporated; that is, the piece was no longer "wetted" by, or wet with solvent. Far as explosive energy available per unit surface area, it's low, but still energetic enough to be a problem (initiation of other reactive hazards, cardiac arrest, such like).
 
I don't know what is being more corrosive with absolute certainty, but judging by the limited view inside the current tank it is the liquid that is causing the biggest problem. However, I don't think vapor is an issue because the tank regularly sees gauge pressures of 3-5 PSI. With the low vapor pressure and the fact of the vapor being 11.9x air density, I would venture the vapor isn't "wildly" contacting the metal in the airspace.
 

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