On Mon, 27 Jan 2020 01:39:21 +1100, "Rod Speed"
wrote:



"Mike Halmarack" wrote in message
.. .
I'm planning to hang a balcony wide board for use as a table or plant
stand. I'd probably find it easiest to cut and shape the hangers from
aluminium. These would hang on the inside of the balcony's balustrade
which is made from galvanised iron or steel.
Would these dissimilar metals suffer any adverse reaction when in long
term contact with each other?

I do have that situation with all my patio door as there is
a steel RHS vertical on each side of each door and another
at the top. Works fine for coming up to 50 years now, but
the aluminium is anodised and the steel is painted.

No harm in providing some kind of buffer, even if the reactivity is
quite low, though the longevity of your doors are quite reassuring.
--

Mike