Intuitively this sounds correct,: silver is a nice bright shiny metal, so
mixing silver in should brighten things up.
In practice 2% is not enough to do anything visually, and the silver just
adds another possible structure to the solder. Thus if time/heat is
excessive this is encouraged and joints can be more grainy. The exact
opposite of what is desired.

Have you considered the possibility that what customer is looking at on the
other boards is not bright shiny solder but bright shiny flux? Some residues
can act like a glossy varnish.

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
Leadfree: www.Pb-Free.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of DUTTON Phil
Sent: Thursday, March 13, 2003 10:58 PM
To: [log in to unmask]
Subject: Re: [TN] : Shining smooth solder joint on ENIG or Gold plating
Board.


Hello Poh,

I remember some discussion on TechNet some time ago regarding one of the
benefits of 2% silver in solder paste being a 'better looking' solder
joint with gold pads.

regards,

Phil.


>Hi Technetters,
>
>Can someone advise me how to get a good smooth shining solder joint on
the
>ENIG board or board with gold plate SMT pads.
>
>As I can understand that board subjected to reflow soldering, the
solder
>joint tends to look dull and not so smooth joint. But, is there any way
to
>get a good shining joint.
>
>Thanks.
>
>Poh
>
>-

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