bushman writes:

What adhesive would be best?

You don't have aluminum. You mean aluminum oxide, at least on the bonding
surface. Stuff don't stick well to aluminum oxide.

The trick is to apply the cement to the oxidized aluminum, and abrade the
oxide off aluminum, with the cement creating a barrier to the air which
would instantly re-oxidize the aluminum. Tool of choise is a stainless
steel wire brush from the welding supply.