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Aluminium/Copper Corrosion, does it stop?

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Posted by Anti-Spam on November 3, 2009, 11:11 am
 
I made a solar panel with copper tube risers and aluminium heat
collecting fins. The fins were formed with a semi circular slot (the
same diameter as the riser) running down the middle. and two of these
fins were clamped around each riser using pop rivets.
The panel works very well, but a white powder corrosion has formed
where the two metals meet. Since making the panel, I have read that
these two metals should not be used togther, but its too late.Does
anybody know what I can expect to happen to the panel, will this
corrosion eventually stabalize? The heat output from the panel does
not seem to be impaired.

Posted by Anti-Spam on November 3, 2009, 11:34 am
 
Sorry further to this question, what metal should I have used for the
Fins?
Do you recommend I take the panel apart and replace the Fins with
another metal?

Posted by Josepi on November 3, 2009, 12:26 pm
 See if you can insert some anti0oxide greese. Electrical people are familiar
with these products.



Posted by dow on November 3, 2009, 7:34 pm
 
Ideally, you should make the fins from copper, i.e. the same metal as
the tube risers are made from.

The white powder is aluminum oxide. The aluminum fins are being
corroded. The risers should not be affected. So, since you're going to
replace the fins anyway, you might as well wait until the performance
of the device diminishes significantly. It may continue to work
satisfactorily for quite a while.

            dow

Posted by Anti-Spam on November 4, 2009, 9:23 am
 On Tue, 3 Nov 2009 11:34:06 -0800 (PST), dow


Thanks for that, not sure I can get copper sheet here easily (also
sounds expensive), I can get tin probably, will that work reasonably
well, as I don't have a massive gap between risers, about 5 inches?

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