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Mon, 17 Jan 2005 10:20:20 -0500 |
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That does not sound good. Silver oxide is black. Sounds like the finish is
compromised. It really depends on what happened to the underlying copper.
Can you sacrifice a board for a solderability test per J-STD-003?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Russell Burdick
Sent: Monday, January 17, 2005 9:31 AM
To: [log in to unmask]
Subject: [TN] immersion silver with dark/black tarnish
Good Morning Technetters,
I have a customer who is questioning the surface look of immersion silver
boards. They had assembled some and halted due to the look of a dark/black
tarnish on the silver finish.
The boards were made and the silver finish applied in China then sent to
subcontractor to assemble. The 3 boards in my gloved hands have one side
with no tarnish or surface irregularities and the second side on has the
dark/black tarnish look on surface pads and a few knees of holes appear
reddish (using a 10X lupe).
What can anyone offer for advice on solderability issues?
Thanks in advance,
Russ Burdick
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