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July 2009

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TechNet E-Mail Forum <[log in to unmask]>, Inge <[log in to unmask]>
Date:
Wed, 29 Jul 2009 09:50:50 +0200
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I'm often asked by the production guys about risk of Au embrittlement, and 
they show a board or a component which they suspect having too much of Gold.
The first test I use to practise takes 10 seconds to perform. I use a Faber
hard rubber pencil and give the board pads or the component terminal a few
hard strikes with the pencil. If the underlying nickel comes up immediately,
it's a good Au flash, and no risk of soldering. And most of the cases belong
to this group. I cannot recommend this 'method' to other than very
experienced ones.

(If I can go on striking the solder pad without seeing nickel, then I have
to do a more advanced examination of course.)

Inge

----- Original Message -----
From: "Gervascio, Thomas L" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, July 29, 2009 12:42 AM
Subject: Re: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT


> How could I get a copy of it? I thought EP&P was out of print..
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
> Sent: Tuesday, July 28, 2009 10:01 AM
> To: [log in to unmask]
> Subject: Re: [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER
> JOINT
>
> Hi Jon - the folks from Lockheed published a very good article on the
> impact of gold on solder joints including the calculations/material
> parameters/graphs that would be useful to you. Pull a copy of this
> article: "Effects of Gold Diffusion on a Near Eutectic Solder Joint", S.
>
> Enwright, Electronic Packaging & Production, June 1998, pp 68-72. Good
> Luck.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
>
>
> "Roberts, Jon (SA-1)" <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 07/28/2009 07:53 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> "Roberts, Jon (SA-1)" <[log in to unmask]>
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> [TN] FORMULA FOR DETERMINING GOLD PERCENTAGE IN A SOLDER JOINT
>
>
>
>
>
>
> Does anyone have or know where to find the formula for determining the
> amount of percentage of gold in a SMT solder joint? Appreciate any
> help, Jon
>
>
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