I have had my 18HT up for 30 years with aluminum tubes in the concrete. I see
no signs of deterioration. That's good enough for me.
Lee, w0vt
> You do not want concrete in contact with aluminum! It will eat up the
> aluminum. Even aluminum windows come with a warning to not let the brick
> mortar come in contact with the aluminum frame when installing.
> After the concrete is set and dried it may be ok then, not sure.
>
> 73
Yes indeed.. Aluminum is readily attacked by most acids and bases: the
surface oxide helps a lot, and, of course, a chemical conversion coating
(anodize, alodine) would too. BUT, a scratch in the coating provides a
nice surface to be attacked.
ALuminum is attacked by most basic hydroxides (e.g. sodium hydroxide,
lye, is used to etch aluminum panels).. It is a way to make hydrogen
gas, in fact.
Mortar is a mixture of quicklime (CaO) and sand, for the most part, and
when you add water to it (slaking the lime) it forms Calcium Hydroxide
(Ca (OH)2).
Concrete has similar chemistry.
So, yes.. keep your aluminum out of the concrete footing.
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