TECHNET Archives

July 2014

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
Date:
Mon, 21 Jul 2014 13:54:37 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (173 lines)
Hi Dick!

Got your picture posted, it's here:

http://stevezeva.homestead.com/Blue_Colored_Solder_Joints.JPG

Steve


On Mon, Jul 21, 2014 at 1:22 PM, Richard Krug <[log in to unmask]> wrote:

> Steve - Please post sample picture of blue colored solder joints.
>
> Dick Krug, CSSBB, CSMTPE
> Lead Process Engineer
> Sparton Brooksville, LLC
> 30167 Power Line Road
> Brooksville, FL  34602-8299
> p (352) 540-4012  (Internal Ext. 2012)
> [log in to unmask]
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Monday, July 21, 2014 2:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] Blue Colored Solder Joints - Possible Causes
>
> Hi Dave!
>
> Got your "Barney Boards" presentation and it's posted here:
>
> http://stevezeva.homestead.com/Case_studies_Barney_boards.ppt
>
> Steve
>
>
> On Mon, Jul 21, 2014 at 11:00 AM, David Hillman <
> [log in to unmask]> wrote:
>
> > Hi Steve - here is Doug's and my picture of  purple solder joints out
> > of one of our ppts you can post:
> >
> > Dave
> >
> >
> > On Mon, Jul 21, 2014 at 10:43 AM, Steve Gregory <[log in to unmask]>
> > wrote:
> >
> >> Hi Dick!
> >>
> >> I've seen that too after cleaning with some really good DI water. I
> >> had solder joints that turned purple on me one time, but they weren't
> >> wave soldered, and it was on a ENIG board and I was using a water
> >> soluble SAC
> >> 305 paste. Here are some pictures of what I was experiencing:
> >>
> >> http://stevezeva.homestead.com/Trippy_Solder.jpg
> >>
> >> http://stevezeva.homestead.com/Trippy_Solder_Close.jpg
> >>
> >> I could "Buff" the purple color away with a stiff bristled solder
> >> joint just as long as I polished the surface well. Here are some
> >> before and after pictures of that:
> >>
> >> http://stevezeva.homestead.com/Before_Buffing.jpg
> >>
> >> http://stevezeva.homestead.com/After_Buffing.jpg
> >>
> >> It wasn't a residue, because I measured the cleanliness with an
> >> omegameter and it was negligible, and the solder appeared the same.
> >>
> >> Then a fellow Technetter; George M. Wenger of Failure Signature &
> >> Characterization Lab graciously offered to analyze this for me and
> >> here's his report:
> >>
> >> http://stevezeva.homestead.com/FSC-5178.ppt
> >>
> >> Steve
> >>
> >>
> >> On Mon, Jul 21, 2014 at 8:29 AM, Richard Krug <[log in to unmask]>
> wrote:
> >>
> >> > We have recently discovered some CCA's with a distinctive,
> >> > transparent blue color on the solder joints.  Viewed perpendicular
> >> > to the solder
> >> joint
> >> > surface, surface looks normal.  The solder surface appears blue
> >> > when
> >> viewed
> >> > at an angle.  I see no residues at up to 30x magnification.  Boards
> >> > were wave soldered using Sn63Pb37 solder with ORH1 flux, then
> >> > in-line water washed with a low concentration of a saponifier as
> >> > one of our common assembly processes.
> >> >
> >> > Any ideas of what the condition is or what caused it?
> >> >
> >> > Dick Krug, CSSBB, CSMTPE
> >> > Lead Process Engineer
> >> > Sparton Brooksville, LLC
> >> > 30167 Power Line Road
> >> > Brooksville, FL  34602-8299
> >> > p (352) 540-4012  (Internal Ext. 2012) [log in to unmask]
> >> >
> >> > ___________________________________________________________________
> >> > ___ This email has been scanned by the Symantec Email
> >> > Security.cloud
> >> service.
> >> > For more information please contact helpdesk at x2960 or
> >> [log in to unmask]
> >> > ___________________________________________________________________
> >> > ___
> >> >
> >>
> >> --
> >>
> >>
> >> This email and any attachments are only for use by the intended
> >> recipient(s) and may contain legally privileged, confidential,
> >> proprietary or otherwise private information. Any unauthorized use,
> >> reproduction, dissemination, distribution or other disclosure of the
> >> contents of this e-mail or its attachments is strictly prohibited. If
> >> you have received this email in error, please notify the sender
> >> immediately and delete the original.
> >>
> >>
> >> _____________________________________________________________________
> >> _ This email has been scanned by the Symantec Email Security.cloud
> >> service.
> >> For more information please contact helpdesk at x2960 or
> >> [log in to unmask]
> >> _____________________________________________________________________
> >> _
> >>
> >
> >
>
> --
>
>
> This email and any attachments are only for use by the intended
> recipient(s) and may contain legally privileged, confidential, proprietary
> or otherwise private information. Any unauthorized use, reproduction,
> dissemination, distribution or other disclosure of the contents of this
> e-mail or its attachments is strictly prohibited. If you have received this
> email in error, please notify the sender immediately and delete the
> original.
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>

-- 


This email and any attachments are only for use by the intended 
recipient(s) and may contain legally privileged, confidential, proprietary 
or otherwise private information. Any unauthorized use, reproduction, 
dissemination, distribution or other disclosure of the contents of this 
e-mail or its attachments is strictly prohibited. If you have received this 
email in error, please notify the sender immediately and delete the 
original. 


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

ATOM RSS1 RSS2