Re: Mojave airport is not a spaceport
From: Andrew Nowicki (andrew_at_nospam.com)
Date: 06/26/04
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Date: Sun, 27 Jun 2004 01:53:17 +0200
George William Herbert wrote:
> Plenty of saltwater boats made out of Aluminum.
>
> The problem is... the Al alloys that do OK in salt water
> are not the Al alloys that have typical aerospace grade
> strength properties. 5052, 5086, 6061, 6063 all do fine
> in salt water. 2 and 7 series don't.
I have already mentioned aluminum ships and buoys
in this thread. There is big difference between a
boat which has to survive in the saltwater environment
for years, and a rocket stage which floats in the ocean
only a few hours at a time. Commercial boats are usually
made of aluminum alloys coated with pure aluminum,
because pure aluminum is more resistant to saltwater
than aluminum alloys. Alloys coated with pure
aluminum are called Al-clad. Boats are sometimes
coated with anodize coating or paint, but these
coatings are too frail for the space environment.
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