I have them
Au= 19.3
Sn= 7.3
They don't work out
It's a good thought though as this is a "known", usually by plating
alternating layers (although a claimed co-plating process is now on offer.)
Regards
Mike Fenner
Indium Corporation
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: 06 January 2006 11:01
To: [log in to unmask]
Subject: Re: [TN] Gold over Tin
Franklin,
Could they be trying to achieve an 80/20 Au/Sn ratio for some high temp
reflow operation? I don't have any atomic mass/density info at my
fingertips. I know it sounds a little off the wall. Must be a really high
Tg laminate if they were.
Steve Creswick - Gentex
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin Asbell
Sent: Thursday, January 05, 2006 1:58 PM
To: [log in to unmask]
Subject: [TN] Gold over Tin
Received an unusual request for quote with a fab note callout for the
following.
1. Plate 200/50 microinches SnAu (very hard)
Now I read that as 200 microinches of tin plating, followed by 50
microinches of Gold and thought to myself..huhhhh!!!
I contacted the buyer and he agreed it was quite unusual but they indeed
need gold over tin. The buyer could not explain why, so I thought I would
see if others have performed this process, and why such uncommonly mixed
coatings???
Franklin
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