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