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#21
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Anybody tried glueing cast aluminum parts together with epoxy?
Regarding the corrosion of aluminum in bonding with epoxy..one of the
homebuilt aircraft was put together using the method of sanding the surface through the still "wet" epoxy. The theory was the epoxy on the sanding surface would minimize the corrosion. |
#22
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Anybody tried glueing cast aluminum parts together with epoxy?
some of the homebuilt aircraft groups may be able to help. I know of one
company that designs and builds reduction gears for the homebuilt market and they use a glue along with mechanical fasteners (bolts). I believe that they use a locktite product. Brian |
#23
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Anybody tried glueing cast aluminum parts together with epoxy?
On Sun, 16 Oct 2005 13:35:55 +0200, GeoffC wrote:
dazed and confuzzed wrote: Aluminum is like silver. It oxidizes almost instantaneously. It is this thin layer that fails when gluing parts. The adhesive bonds to the oxide layer and the oxide fails, not the glue. I wonder how the Lotus Elise stays together then? It has an aluminium tub-chassis, constructed from aluminium extrusions bonded together with epoxy resin. It's not that you can't epoxy aluminum. Of course you can. You just have to do good surface preparation first. There are products designed for this. Someone mentioned an etch sold by West Systems or something like that. I think there is something called Marine Tex that bonds well to aluminum. But in the OP's case, I would just use JB-weld to stick the piece back in, then put a single layer of fiberglass/epoxy over the outside of the broken piece, then paint. I would sand the area in the immediate vicinity of the break down to bare metal and clean with acetone or alcohol prior to applying the epoxy. Surface preparation is EVERYTHING in bonding applications. --Mac |
#24
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Anybody tried glueing cast aluminum parts together with epoxy?
On Sun, 16 Oct 2005 07:53:43 -0700, "patrick mitchel"
wrote: Regarding the corrosion of aluminum in bonding with epoxy..one of the homebuilt aircraft was put together using the method of sanding the surface through the still "wet" epoxy. The theory was the epoxy on the sanding surface would minimize the corrosion. Reminds me of a sure fire stunt to pull on electronics technicians. You ask them to bet you can't solder some aluminum alloy sheet strips together with regular solder. They think it's a sure thing. You prepare two strips, and scrape the surface with your pen-knife, Then you place a blob of hot solder on the strip. (Of course it doesn't tin) Then you scrape the strip through the melted solder. It tins under the scrape, if its hot enough. Soon you've scraped a good length of tinning on the strip, and you prepare the other strip the same. At that point, you sweat the two tinned strips together in the usual way. Try pulling them apart. They will break away from the sweated lap joint. Brian Whatcott Altus OK |
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