Hi folks! Ok, here is the science: Gold dissolves into a Sn60Pb40 solder
bath 1 um (40 uinches) per second at 200C (W. Bader's data). So at 500F
(260C) you increase the dissolution rate to over 4um (160 uinches) per
second. Contrast those dynamics with these elements using a Sn60Pb40
solder bath : Palladium dissolves at 1 um per second at 400C: Nickel
dissolves at 1 um per second over 500C!
Dave Hillman
Rockwell Collins
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Werner Engelmaier /* <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
05/01/2008 10:15 AM
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Re: [TN] De-golding?
Hi Dean,
No science--it just works.? Actually, any T above the Liquidus of solder
will work, higher T's will work faster.
Werner
-----Original Message-----
From: Stadem, Richard D. <[log in to unmask]>
To: [log in to unmask]
Sent: Thu, 1 May 2008 11:01 am
Subject: Re: [TN] De-golding?
Good question. We use 500 deg. F. because we run our wave solder at 500
deg. F. and because 500 degrees F. is what we have been tinning at for a
long, long time, at least since the late 60's. I have no idea whether
that is the optimum temperature for dynamic wave tinning or not. I do
know that at least 9 companies in the Minnesota area, three in North
Dakota, and two in South Dakota all tin their parts at 500 deg. F. also.
I'm sorry I cannot tell you the science behind that temperature.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Braddock, Iain
Sent: Thursday, May 01, 2008 9:32 AM
To: [log in to unmask]
Subject: [TN] De-golding?
Apologies if this has found its way through before, I got an error
sending message from TechNet.
What temperature do you use for your SnPb de-golding pots and what is
the reason for your particular choice?
CIA,
Iain
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