This is an interesting thread.
Does your data give a number for Nickel?
Regards
Mike Fenner
Applications Engineer, European Operations
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Wenger,
George M.
Sent: Thursday, July 31, 2003 6:54 PM
To: [log in to unmask]
Subject: Re: [TN] Thick Palladium on Leads
Bev,
How thick do you consider "thick undercoat"?
The NCMS PWB Surface Finishes work from several years ago looked at Pd
surface finishes. One issue with Pd is that it dissolves much slower than
other finishes. The best data I've seen on dissolution rates is the 1969
Wally Bader work published in the December Welding Journal.
For near eutectic SnPb solder at 450F
Material Radial Dissolution Rate (10-6in/sec)
Gold 117.9
Silver 43.6
Copper 4.1
Palladium 1.4
Regards,
George
George M. Wenger (908)-546-4531
Reliability Engineer
RF Power Amplifier Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059
[log in to unmask]
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Thursday, July 31, 2003 1:28 PM
To: [log in to unmask]
Subject: [TN] Thick Palladium on Leads
Technetters,
I have searched the archives and all I have been able to find is one
informative e-mail from Phil Hinton from August 22, 1998. Has anyone every
run across palladium as a thick undercoat? if so, what, if any, grief did
it cost you?
regards,
Bev Christian
Research in Motion
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