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Date: | Fri, 9 Jul 1999 11:39:51 -0700 |
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Donna,
Plate the gold over the nickel. The nickel deposit serves
two purposes. First, it acts as a barrier, preventing
diffusion of the copper into the gold. A second but not
often recognized advantage of gold over nickel is the
"brinelling effect" whereby a thin layer takes on the
physical characteristics of the substrate, In your
application, the harder nickel makes the softer gold more
durable.
Regards,
Dan Brandler.
Donna Perry wrote:
> If we want a board to be gold plated .00003 to
> .00005 thick, can it be done over electro-plated
> copper or must nickel be applied first?
>
> DPerry
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