"Richard Casady" wrote in message
...
On Thu, 4 Dec 2008 20:56:51 -0800, "Calif Bill"
wrote:


"Richard Casady" wrote in message
. ..
On Wed, 3 Dec 2008 11:27:14 -0800, "Calif Bill"
wrote:

I think the Sheffield was mostly steel and the aluminum in question was
a
high magnesium content alloy.

Probably no more than 5%. The stuff, and copper as well, harden
aluminum as carbon hardens iron.

Casady

Won't be any copper to speak of in aluminum exposed to sal****er.

They make some outboard motors from beer can scrap. Nearly pure
aluminum, for corrosion resistance.

Casady

50xx and 60xx series alloys. 50xx with more flexibility in forming and 60xx
for more strength.