The immersion silver we use has a co-deposited organic solder preservative.
That might be what they mean.

I'd be very careful about running electroless nickel through an immersion
silver process.  I'm not an expert on this, but I would think the immersion
silver process would be setup specifically to work on copper.  Depositing on
a different base metal might give a completely different result.

If you get a deposit, it might not be solderable, the thickness may be
vastly different than what you get with silver.

As bad as that seems, the real concern I have is the effect on your
immersion silver process when you run a different metal through it.  By
adding nickel to the bath, you may contaminate it and ruin your normal
silver surface finish.

Perhaps someone who knows more about this can confirm or deny this.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James Hofer
Sent: Thursday, November 04, 2004 10:41 AM
To: [log in to unmask]
Subject: [TN] Immersion Silver

I have a customer asking for Imm Silver over 100um NI. I am concerned
putting the Silver over the NI as it may lift or peel. This is the first
time I have had this kind of request. Have any of you well informed Tech
Heads heard of this before???
ps. This customer also asked for OSP over the Silver over the NI. I KNOW
that is not done.

Thanks for any feedback,

James Hofer

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