Ugh,
Last time I saw something like that was on a wave solder machine where the
solder pump impeller was breaking up which lead to a very "rough" looking
joint with traces of iron.
John Burke
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, June 24, 2009 6:41 AM
To: [log in to unmask]
Subject: Re: [TN] SN100C I don't like the look of board pads
Morning Inge and Everybody!
Got your pics posted Inge, and as usual, your pictures always give me a
new window in which to see things. Here they are:
http://stevezeva.homestead.com/files/SN100CSEM1.jpg
http://stevezeva.homestead.com/files/SN100CSEM2.jpg
I renamed your files and saved them as *.jpg files because my web page
doesn't allow me to use *.tif files. We've only used SN100 here a few
times, and you're right, ours looked just like regular 63/37 HASL. We've
never had a SEM done on the boards we used, so I have nothing to compare
your images to. But the boards we used were nice and shiny.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Wednesday, June 24, 2009 7:55 AM
To: [log in to unmask]
Subject: [TN] SN100C I don't like the look of board pads
Hi all,
will send pictures to Steve.
The two SEM images show SN100C boards that we got recently.
I don't like the look of the solder surface. Very grainy and with lots
of copper (darker spots). EDAX gives even fragments of iron. My first
thought was that the manufacturer had contaminated baths, which will be
denied, of course. Anyway, my opinion is, that SN100C should be more
like ordinary tin/lead, i.e nearly zero copper and a more shiny
approach.
/Inge
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