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February 2011

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Subject:
From:
Jack Olson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack Olson <[log in to unmask]>
Date:
Wed, 9 Feb 2011 08:10:43 -0600
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Good question.... and when looking at an actual board, how is one to determine 
visually if we are looking at "staining" or "oxidation/corrosion"? Inquiring minds 
want to know. 
(many would say that even oxidized boards are solderable and acceptable. 
right? I think I just read that somewhere...)

Jack

.
On Tue, 8 Feb 2011 09:20:44 -0500, Glidden, Kevin 
<[log in to unmask]> wrote:

>Morning everyone,
>I have a question on IPC-4553, specifically, section 3.1 "Visual", and 
specifically regarding staining of immersion silver.  The text states "The 
coverage shall be complete and the finish shall be uniform on the surface to be 
plated (see Figures 3-1 through 3-5 for properties visually identified with IAg 
plated surfaces)"  Figure 3-1 shows 'Example of Uniform Plating", with no 
staining.  Figures 3-2 through 3-5 show staining.  Is this to imply (without text 
to support) that any staining of immersion silver is determined to be non-
uniform and therefore a defect?
>Thanks.
>

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