Kevin:
If you weren't removing all of your water-soluble flux residues,
you'd be having serious issues, regardless of the type of RMA
flux you're using. So it sounds like you might be getting enough
of the water-soluble residues off there.
On the other hand, RMA residues are pretty benign in many cases.
So in this situation, I don't think it matters whether your RMA contains
halide.
By the way, I think your instincts about cleaning RMA with a brush
and IPA are correct. Brush-cleaning breaks up the blobs of flux, but
pretty much spreads the flux around and leaves it on the surface. If
you don't flush off those residues somehow, they might not
cause corrosion or electromigration in themselves, but you might
have secondary effects like problems with adhesion of conformal coat.
And any water that gets into that gap and is trapped under the coating
will cause more problems.
-Joe
-----Original Message-----
From: Glidden, Kevin [mailto:[log in to unmask]]
Sent: Monday, April 19, 2010 11:42 AM
To: TechNet E-Mail Forum; Kane, Joseph E (US SSA)
Subject: RE: [TN] Flux-Cored Wire Solder: Halide / Halide-Free
Great question, Joe.
We use a water soluble paste, followed by DI water wash.
Secondary hand soldering uses RMA flux and (sigh) the fabled isopropyl alcohol localized hand cleaning. I'm also working on improving this and moving to a saponified wash for all levels of soldering....
But, for now, (and part of the basis of my concern) the hand soldering with the wire is only hand cleaned, thus my desire to take use halide-free and hopefully make it less risky...
Kevin Glidden
Manufacturing Engineer
Astronics Luminescent Systems Inc.
-----Original Message-----
From: Kane, Joseph E (US SSA) [mailto:[log in to unmask]]
Sent: Monday, April 19, 2010 11:33 AM
To: [log in to unmask]
Subject: Re: [TN] Flux-Cored Wire Solder: Halide / Halide-Free
Kevin:
Are you cleaning off the flux residues? If this is a no-clean process, and you're leaving residues on, then interactions between the chemistries become more important.
-Joe
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden, Kevin
Sent: Monday, April 19, 2010 11:18 AM
To: [log in to unmask]
Subject: [TN] Flux-Cored Wire Solder: Halide / Halide-Free
Greetings,
I've recently been looking into changing out some solder materials. I was forced to change solder pastes due to product obsolescence. I am now in the process of verifying compatibility of the hand soldering fluxes and solders with the new paste. My current paste is halide-free. My current flux cored wire solder is not. I asked a supplier about halide-free flux-cored wire solder and the basic response is that you can get it, but it's really non-standard, so it's a lot more expensive with larger min-buys. Indeed, after I looked at a few websites about product offerings, it appears most flux-cored wire solders are not halide-free. I understand that I can basically use any materials I like as long as I test it out and can prove my "recipe" is safe to the overall product reliability, but seemingly halide-free is a safer way to in general.
So I am wondering:
1) Am I worrying about nothing (matching halide-free paste with halide free solder wires)?
2) Is it really not all that common to use halide-free flux-cored wire solders?
As always, thank you in advance...
Kevin Glidden
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
-----------------------------------------------------
|
