Subject: | |
From: | |
Reply To: | TechNet E-Mail Forum. |
Date: | Wed, 5 Aug 1998 18:03:03 -0400 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
At 03:18 PM 7/31/98 -0400, you wrote:
>I would think it wise to address the problem from a chemistry standpoint
>or use an alternate surface finish before going the electroplated Nickel
>route. You will immediately either alienate or disqualify most of your
>PCB suppliers. Using electroplate requires surface continuity (unless
>you're fortunate enough to have a design that is internally bussed, very
>unlikely!) so you're generally forced to do a body plate prior to
>surface cu foil etch, This most likely would entail the inclusion of an
>electrolytic gold flash as well because the nickel would be difficult if
>not impossible to re-activate if you were trying to utilize an immersion
>gold process later on. Not only will line definition suffer, you run
>the risk of nickel slivers after etch, and lastly I doubt most profit
>margins will warrant the additional expense of body plated gold!!
>
We do run this process, i.e. body plated bright electrolytic nickel which
serves as etch resist , then soldermask and immersion gold (Oromerse MN) on
the exposed pads and thru-holes only. Applications are surface mount where
a requirement for nickel-gold as a contact surface also exists,
solderability is excellent, several passes OK. Activating the nickel just
before gold is the key; we found a product called NiACT from Surface Tek to
be effective and reliable.
George Anderson
President
Uvonics Co. Inc.
2162 McKinley Ave.
Columbus, Ohio 43204 (614) 274-0040
<[log in to unmask]> http://www.uvonics.com
################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE TechNet <your full name>
To unsubscribe: SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|
|
|