Phil,
Alluminum to tin lead surface does not work well with aging effects. We
Nickel Plate (electrically deposited) all terminals which are in contact
with to tin-lead surface. In addition, we add a contact lubricant , Nyogel
760G to the contact surfaces to seal out oxygen. We have a good track
record with this combination.

Interfaces to stay away from, these were huge failures.
Alluminum to Tin Lead
Alluminum to Nickel

Mark



                    Phil Nutting
                    <PNutting@KAISERSY       To:     [log in to unmask]
                    STEMS.COM>               cc:
                    Sent by: TechNet         Subject:     [TN] connecting aluminum to copper
                    <[log in to unmask]>


                    04/10/02 04:12 PM
                    Please respond to
                    "TechNet E-Mail
                    Forum."; Please
                    respond to Phil
                    Nutting






Good afternoon TechNet,

Would anyone like to share their knowledge about using an aluminum standoff
as a conductor when connecting two circuit boards together.  I suspect that
if it were aluminum to copper there would be an issue, but what about
aluminum to HASL surface of circuit boards?

Thanks in advance for your wisdom,

Phil Nutting

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