Hi Scott,
I don't have a solution for your problem except to say that you're
depositing on metal and should have no issues if it is clean. Unless the
silver is actually lifting off. I think it could be a surface prep issue or
contamination from either the PCB house or your fabricator in handling. Get
the surface analyzed and cleaned, then retry.
That being said, there have been studies by some OEMs that indicate
capability of Immersion Silver as a contactable surface in lieu of gold.
That is one of the reasons Immersion Silver's popularity has increased.
Unfortunately, I don't have the details and reports but someone on the Forum
might.
Good Luck,
LS
-----Original Message-----
From: Douglas, Scott [mailto:[log in to unmask]]
Sent: Friday, August 18, 2006 10:41 AM
To: [log in to unmask]
Subject: Immersion Silver and Conductive Carbon Ink
Fellow list persons,
=20
I have a printed circuit board used in a remote control unit. We changed
the solder plating on the board to immersion silver for RoHS compliance.
Our fabricator is having a problem getting the conductive carbon ink to
stick to the immersion silver. Is anyone aware of this type of problem?
We are trying to figure out if we just have a vendor problem or is there
some issue with the immersion silver and conductive carbon ink
combination. Any suggestions as to changes or corrective actions?
=20
As always, thank you in advance for your comments.
Scott Douglas, NCE=20
Staff Technical Specialist
Harman Specialty Group=20
3 Oak Park Drive=20
Bedford, MA 01730=20
Phone: (781) 280-0406=20
Email: [log in to unmask]
Web: www.harmanspecialtygroup.com=20
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