Yep! as my colleague Chris explains more fully.
Please keep in mind that when publishing a solder chart for use by anyone
needing information on solders (as opposed to other joining methods ) not
every one solders just PCB assemblies - where unlike elsewhere - very thin
sub-micron protective gold coatings are a norm. So in the context of all the
alloys in the chart and all the things that could be soldered, a general
rule not to pick out a high tin content alloy for use on gold is good.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Friday, March 30, 2007 1:25 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering using Sn96
Happy Friday Jim! This is only a guess but one possible reason for such a
recommendation is the potential to have solder joint integrity degradation
due to gold embrittlement. A high tin content solder alloy and gold surface
finishes do not necessarily mean a gold embrittlement situation but it
would be on aspect of a solder process that would need to be kept in mind.
Dave Hillman
Rockwell Collins
[log in to unmask]
"Marsico, James"
<James.Marsico@ED
OCORP.COM> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
03/30/2007 06:46 [TN] Soldering using Sn96
AM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
"Marsico, James"
<James.Marsico@ED
OCORP.COM>
Technetters:
I happened to come across a solder chart from the Indium Corporation and
noticed that they do not recommend using Sn96 solder on gold-plated
surfaces. Can anyone elaborate on this?
Jim Marsico
EDO Corporation
1250 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
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