I have noticed that when using epoxy on die cast aluminum the results are
not always good.
The same thing goes when trying to weld die cast aluminum or any castings
produced with re - cycled aluminum. Extrusion stock or investment castings
done with virgin aluminum blended with alloys can be welded and bonded with
epoxy resin much better. In order to make money die casting companies have
to use re - cycled aluminum. This is because it does not stick to the
ejection mold and production speed can be increased to maximum. On average
the composition of re - cycled aluminum contains large percentage of
manganese, iron and silicon. When involve in Military contract and similar
projects a chemical analyses certificate of the aluminum is requested and
has to be validated.

"Sal's Dad" wrote in message
...
I have tried this myself - using a grinder to "wet-sand" aluminum plate,
using resin as a wetting agent. Then mixed the epoxy directly on the
plate,
working in well.

Held up for a few years, but eventually bond broke. Of course, it may
have
had something to do with the aluminum being used as a "skid plate" under
the
bow of a plywood boat, for hard ledge landings. The 1/8 plate was worn
more
than halfway through before it de-laminated.

Good luck, and let us know how i works!

Sal's Dad


"Roger Derby" wrote in message
nk.net...
It's been suggested that one first coats the aluminum with the epoxy.
Then, while it's still liquid, scrub the aluminum with a wire brush to
cut
thru the oxidation and permit a bond to the real aluminum.

Roger (I haven't tried this, myself.)

http://home.earthlink.net/~derbyrm
"William R. Watt" wrote in message
...

There was a discussion in this newsgroup recently about gluing broken
aluminum with epoxy. It seems instantaneous oxidation of exposed
aluminum
prevents a good bond with epoxy.

John McCoy ) writes:
I have an aluminum casting which has broken. Does anyone have any
experiences or recommendations on the likelyhood of success, glueing
it back together with epoxy? I have West System on hand, and can
fairly easily get other products (e.g. Aluminax). Any tips,
techniques, or pitfalls I should be aware of?

thanks,

John


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