Re: Gold plating the entire PCB
- From: qrk <SpamTrap@xxxxxxxx>
- Date: Wed, 02 Apr 2008 17:56:44 GMT
On Tue, 01 Apr 2008 21:40:10 +0000, Guy Macon
<http://www.guymacon.com/> wrote:
You're only worried about the part that gets soldered. Most boards,
qrk wrote:
It's the thickness of the gold layer. Supposedly, immersion gold layer
is thin enough (<1um) where its absorbed into the solder and not
enough to cause embrittlement.
...but only if the entire gold surface is wetted by solder.
This is not the case if you gold plating the entire PCB.
these days use a soldermask to prevent solder from getting sucked off
the pad down the trace. If this is for a home made board without a
soldermask, then disregard everything I've said. What I'm spewing is
for commercially made boards.
Also, after the gold is dissolved, the solder has to wet
tin, not copper.
After the gold is dissolved, the solder is in contact with nickle
plated over the copper. Commercially plated boards have the copper
pads as the base material, nickle plating over the copper, then gold
plating over the nickle.
.
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