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May 2001

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Subject:
From:
Ken Mc Gowan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 18 May 2001 13:00:30 -0100
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Hi Peter,

US normally specifies Co whereas Europe is predominantly Ni. Electrically
there are no major differences. Co deposits can be up to 20% harder under
certain conditions. I agree about dragout/dragin this is usually controlled
by the use of Au strike.

Best Regards,

Ken Mc Gowan
----- Original Message -----
From: "peter blokhuis" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, May 16, 2001 6:17 PM
Subject: [TN] Cobalt or Nickel hardened gold?


> Does anyone know why Cobalt much more prevalent than
> Nickel as a hardener in electrolytic gold plating?
>
> From the plater's perspective, nickel seems to make
> more sense since this is dragged into the gold tank
> from the nickel plating tank upstream.  This dragover
> serves as an automatic hardener addition, thus
> simplifying process control.
>
> Do any of you assemblers out there specify Cobalt? Why?
>
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