Aleks:
Since nobody (to my knowledge) has done any sort of research on the fluoborate baths in years, this could be an issue if the bath is made up in the way they were traditionally, but, modern baths tend to be higher in acid, and lower in metal, and this should at least minimize the problem.
Recall, my initial issue with Sulfate and Methane Sulfonate baths was because of the potential for etch voids at any current density, but especially at the lower CD areas, so switching to fluoborate should minimize the Stannic oxide caused etch voids, and by adjusting acid/metal ratio, you would only get better.
As I recall (and I am old enough to recall!) etch voids did not seem to be an issue in the era when fluoborate baths were the rule, rather than the exception.
Rudy Sedlak
Aleks Lozinsky <[log in to unmask]> wrote:
Hi Rudy,
What about throwing power of pure Tin fluoborate solution? From what I tried
several years ago this solution, using standard organic additives for
fluobarate tin/lead bath, has not so good throwing power compare to MSA or
Sulfuric Acid based Tin plating solutions. It's easy to see on Hull Cell
test panel and if implemented can lead to etch voids.
Aleks Lozinsky
Technic Canada
----- Original Message -----
From: "R Sedlak"
To:
Sent: Monday, October 17, 2005 9:29 PM
Subject: [TN] More Electrolytic Tin Plating
Sona:
I do not recommend your "plating" the lead out of your Tin/Lead bath, it is
too uncontrolled.
(And actually, it would, theoretically, take you forever to get to true
"no-lead"..it would just keep getting less and less.)
I do recommend you start over, using the fluoborate electrolyte system,
rather than the sulfate, or methane sulfonate system.
Sorry to have been unclear in my recommendation.
I think the Fluoborate electrolyte is THE way to go, but if you go there, do
it suddenly, not gradually.
And always remember, free advice is often not worth what you paid for it...
Rudy Sedlak
---------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
|
