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Posted for Guy Buchanan <bnn@compuserve.com>:

Marv,
Some typically used aircraft aluminum alloys:

Alloy Yield Ult. Endur. % elon. Galv. Price
----- ----- ---- ------ ------- ----- -----
2024-T4 47 68 20 19 ~0.85 $3.71
6061-T6 40 45 14 17 ~0.85 $2.35
7075-T6 73 83 23 11 ~1.03 High

Source: Machinery's Handbook 23

I don't use any other aluminum alloys except in exotic
applications where I might use Al-Li, Al-Be, or SiC reinforced Al.
Don't paint anodized parts simply because it's not necessary
and because nothing sticks to anodizing anyway. Talk to your
anodizer about all the options. For marine I use Type III, which is
thicker than Type II but limits your color options. For working
parts I specify teflon impregnation which makes the parts glossy
and slick.

Guy Buchanan
Buchanan & Newcom