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July 2011

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 7 Jul 2011 11:47:35 -0500
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Is the corrosion showing up at the edge of the tin plated shield shear point?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah
Sent: Thursday, July 07, 2011 11:32 AM
To: [log in to unmask]
Subject: Re: [TN] ENiG causing galvanic corrosion?

Can you send photos of the corrosion?
Do the corrosion exist at the Tin plated borders or on all the area?

Reuven

On Thu, Jul 7, 2011 at 7:07 PM, Pete <[log in to unmask]> wrote:

> We've got an assembly here showing all kinds of galvanioc corrosion after
> humidity tests.  Looking at the galvanic chart, I notice that gold and tin
> are pretty far apart.  Our tin plated shields are what's corroded.
>
> Am I thinking too much into this?  Would ENiG on  PCB really act as the
> cathode for tin plating, aluminum hardware, etc.?  That would mean an awful
> lot of corrosion out there, there's lot's of board assemblies like this.
>
> Pete
>
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-- 

Best Regards,

*Reuven Rokah*

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