Russell:
The problem you are having is not unique to you. A lot of people have it.
The stripper supplier is supposed to include an ingredient which prevents Tin
from immersion plating, and some vendors, ahh, overlook, including that
ingredient. Not that this is the only source of the problem, and the only
problem.
All Tin going into the resist stripper is going to have SOME oxide on it, but
some electroplated Tin will have more than others. If your Tin plating bath
is especially milky, this can be a source of the problems. The milkiness is
from Tin oxide which is not soluble in the plating bath, and which can
co-deposit with the Tin metal. This extreme excess of Tin can "overwhelm"
the small amount of inhibitor in the resist stripper, and consume it.
Now, a proper stripper vendor would sympathize, and GIVE you more inhibitor
to add, to allow you a band-aid, to get you through this problem, until you
got the Tin oxide filtered from your plating bath....
And, just because I am feeling SO glad to be back from the IPC show, which
was a disaster aborning...you coulda had bowling in the aisles, and not hit
an attendee.... I will offer to send you some inhibitor to bail you outta
this problem.
What A Guy!
How big is your sump?
Rudy Sedlak
RD Chemical Company (650-962-8004)
---------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
