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]
>> >
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