Thanks for your help, Inge. It got me thinking about greasy fingerprints, however. The engineers here tell me acid will not remove fingerprints. And this precleaning process uses acids. Supposedly alkaline cleaning removes fingerprints.
Louis
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Friday, March 21, 2008 11:04 AM
To: [log in to unmask]
Subject: [TN] SV: [TN] preparation for HASL
Agree. Solder flux is for oxides, remember! Solder flux does not take
grease! At least what I have learned. There may be formulas that take even
grease, but we don't have them.
/Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Lee parker
Skickat: den 21 mars 2008 15:36
Till: [log in to unmask]
Ämne: Re: [TN] preparation for HASL
Louis
I would continue the process as you are currently doing. You can never be
too clean or too rich.
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: "Louis Hart" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, March 21, 2008 10:20 AM
Subject: [TN] preparation for HASL
TechNetters, a question has come up in our plant about cleaning copper
surfaces before HASL. (Solder used is the standard tin-lead.) We've been
putting panels through a light acid clean and etch, then through a
Quicksilver flux applicator with two rollers that appear to be saturated
with Enthone 757 SG flux. Someone has asked if that acid clean and etch are
really necessary, since what is flux supposed to do?
Any comments on the need for the acid clean and etch would be most welcome.
Many thanks - Louis
Louis Hart
Compunetics
Monroeville, PA
USA
[log in to unmask]<mailto:[log in to unmask]>
412-858-1272
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