FreeLists / si-list / [SI-LIST] Re: Metal to Metal Question

["John Trammel" <jdtramme@xxxxxxxxxxxxx>]

Dave,

Your application is a compression interconnect application.  Therefore the
question for the appropriate plating is a matter of contact physics.  The
steps are to determine the environment, product life, contact interface
normal force and maximum acceptable interface resistance.  Once that
information has been determined, it should be relatively easy to select the
best choice of plating for the aluminum rails.

John Trammel

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On
Behalf Of Dave Hoover
Sent: Thursday, October 11, 2001 11:17 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Metal to Metal Question


Hello group.
I have a customer who has an RF metal can made of
machined Aluminum that bolts up against a PCB. At
the mating locations between the PCB and the aluminum
is selective plated Nickel Rails. That multiple
surface finish requirement has a premium ($$$$)
and I was wondering what is normal (or typical) in
the EMC industry. Do most people bolt up against Tin
Lead (against aluminum), or do they normally have the
aluminum plated with Nickel?

I did check the electromotive force charts and quite a
few finishes appear to be "out of the question".

(This is what I have found si far)
Aluminum (pure)         -0.80
Nickel                  -0.24
(Copper                 -0.34)


Tin                     -0.14
Lead                    -0.13

(Possible issues due to fretting or galvanic reaction)
Silver                  +0.80
Gold    (I didn't find gold but I know it's a + value)

Let me know what is typical in the RF Industry.

Thanks for any and all replys,

David Hoover
Field Application Engineer
Data Circuit Systems, Inc.


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