Ag conductives on Al will work for a short time -hours - then go open
circuit as an insulating layer forms at bond-line. (Joints remain
mechanically bonded)
You can zap them back again by whacking with a lot of volts, but they will
fail again.
Leastways this was the situation when I was involved in conductives a few
years ago now. It is possible that someone has come up with an inhibition
mechanism, so long shot: it might be worth doing a check with suppliers like
Ablestik.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric CHRISTISON
Sent: Wednesday, October 29, 2008 3:10 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering to Aluminum?
Good luck Pete.
Regarding conductive glues. Most of these are filled with silver so you'd
get a nice galvanic cell set up. You would need to be very careful with glue
selection. You wouldn't want to recall 3 million circuits once you
discovered they'd started corroding in the field...
Regards,
Pete Houwen wrote:
> Has anyone tried soldering lead free to an Aluminum circuit on polyester?
>
> We are looking at a very simple one component circuit that needs to be
> on a material with some flexibility. We do run millions of feet of
> aluminum on polyester passive circuits in one of our plants. I am
> being asked to see if we can take advantage of the in house production to
save some cost.
>
> My other thought is to just try a conductive adhesive, but we might
> need to do some tooling for that, as this would require about 3
> million of these circuits/year.
>
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--
Eric Christison Msc
Mechanical Engineer
Consumer & Micro group
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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