Re: Zinc /Aluminum Compatibility?

Magnalium, ferroaluminum and other alloys are galvanic nightmares as-is.

Aluminum is often alloyed with zinc and called potmetal (usually the Zamak
series of alloys, ranging from 4% to 27% aluminum, balance zinc, with a dash
of Cu and Mg).

Zinc isn't as strong a reducer as aluminum so if anything, you'll get fewer
reactions with such things as nitrate (reducing to ammonia). It is a
transition metal neighboring copper so its compounds may sensitize chlorate.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

"John Reilly" <johnr@xxxxxxxxx> wrote in message
news:1134153991.173895.168420@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Any thoughts on possible corrosive, galvanic or other reactions from
> Nitrate and or Potassium Chlorate/ Perchlorate compositions with an
> excess of zinc and aluminum fuels? I'm back to testing some
> experimental formulations I worked on some years back and although I
> didn't have any obvious problems, I know of corrosive and electrical
> issues between say, iron and aluminum in building products. For
> example, aluminum siding for homes was only to be installed with
> galvanized (zinc coated) iron nails or aluminum nails. The alloy
> ferroaluminum would seem to be problematic but evidently is not, though
> I haven't used it yet. I have coated iron with copper before using it
> in some experiments as well, and that too, may be revisited in
> combination with aluminum and magnesium/magnalium mixtures. Brass
> (copper/zinc 60/40) powder is another alloy to be tested w/ HCB/ Saran/
> Chlorate. The possible copper chlorate demon is taken under advisement
> and I'm always happy for more.
> Thanks for any input you may have.
>
> John Reilly
>


.

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