I agree, very nice job!

But it seems like it doesn't explicitly state the conclusion, which is (I presume):

Someone screwed up and had the connector gold (thick) put on some of the component mounting pads.  The only way to get reliable solder joints is to thoroughly wet it by hand and wick it off or just get new boards made correctly.

Or am I missing something?

Wayne Thayer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Friday, January 13, 2012 9:27 AM
To: [log in to unmask]
Subject: Re: [TN] Strange Gold? (Analysis Done!)

I think this is an excellent report. Very interesting to see the gold "pushed" in front of the molten solder, concentrating it. George and Andy are to be congratulated.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, January 13, 2012 7:56 AM
To: [log in to unmask]
Subject: Re: [TN] Strange Gold? (Analysis Done!)

Hope this Friday 13th is going well for everyone,

Remember my post from back in November about the strange looking gold? The
one with the purple looking solder?

Well, I got that analyzed by one of our own Technetters; George Wenger. Him
and his partner Andy Giamis were able to find time in their busy schedule to
do this for me, for which I'm humbly thankful.

It's pretty interesting. Here's my original post:

..............................

Hi All,

Below is a photo of a SON8 footprint that was printed with SAC305 on a
Gold plated PCB and reflowed. I have never seen this before. Is this "purple
plague"? If it is, exactly what causes it?

http://stevezeva.homestead.com/Strange_Gold.jpg

http://stevezeva.homestead.com/Trippy_Solder.jpg

http://stevezeva.homestead.com/Trippy_Solder_Close.jpg

Steve
..............................

I printed up one of the same panels we had the purple solder on with the
same SAC305 paste and reflowed it without parts, and got the same purple
looking solder. So I sent it to George and Andy, and here's the analysis
that they did. It's really good if you ask me.

http://stevezeva.homestead.com/FSC-5178.ppt

Steve

P.S. Thanks again George and Andy!


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