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June 2004

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Subject:
Re: Yellow Discoloration of Immersion Silver Boards
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 16 Jun 2004 17:40:48 +0300
Content-Type:
text/plain
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text/plain (61 lines) 
Another possibility is silver tarnish due to sulfides either in the air
(e.g., industrial pollution) or unsuitable packing materials such as
paper/cardboard containing sulfides.

Brian

Richard Kraszewski wrote:

> We are seeing yellow discoloration of Immersion Silver Boards right out
> of the package from our board house.  They seem to solder fine, however
> this is causing some concern with our customer.  I suspect that it could
> be a thin film of  silver bromide or silver carbonate both which are
> yellow powders.
>
> Any one seen this before?
>
> What is it?
>
> How does the board house remedy this situation?
>
> Any associated concerns or other bits of wisdom?
>
> I would truly appreciate any input.
>
>
> Rich Kraszewski
>
> Advanced Manufacturing Engineer - KEDS
>
> Phone:  260.925.8919
>
>
>
>
>
>
>
>
>
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