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Subject:	Re: immersion silver and exposed copper in small vias
From:	"Hogg, Blair K." <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Hogg, Blair K.
Date:	Tue, 6 Mar 2007 16:43:50 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (193 lines)
I guess I'll have to replace all that corroded copper pipe in my house
with the plastic kind....

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, March 06, 2007 4:24 PM
To: [log in to unmask]
Subject: Re: [TN] immersion silver and exposed copper in small vias

Or the Statue of Liberty... 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna
Sent: Tuesday, March 06, 2007 3:26 PM
To: [log in to unmask]
Subject: Re: [TN] immersion silver and exposed copper in small vias

That's why they build church roofs out of it I suppose...

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Tuesday, March 06, 2007 4:20 PM
To: [log in to unmask]
Subject: Re: [TN] immersion silver and exposed copper in small vias

Is this really true?  I have only been at this around 7 yrs, but
everything I was ever taught says exposed Cu is not allowed for risk of
corrosion.
 

-----Original Message-----
From: Wayne Thayer [mailto:[log in to unmask]]
Sent: Tuesday, March 06, 2007 3:52 PM
To: [log in to unmask]
Subject: Re: [TN] immersion silver and exposed copper in small vias

And what's wrong with exposed copper?  You certainly aren't going to try
and solder down there, are you?  Copper does not corrode quickly, and if
its going to be in a corrosive environment, you're going to have to
conformal coat anyway!

The silver is put on boards only to extend the solderability lifetime of
the bare copper, not as a protectant to prevent opens due to corrosion.

This is not a reliability issue at all.

Wayne Thayer

>>> [log in to unmask] 3/6/2007 12:10:08 pm >>>
Hi Fran
The amount of mask intruding into the hole will depend on the
application method. Our curtain coat operation can cause the mask (circa
1-2 microns) to penetrate about 1/3rd into the hole from both sides but
it has not affected the silver taking on the remaining surface. Is the
mask too thick at the hole entrance to prevent the plating solution
getting good access?
You may also need to confirm by micro section what your customer thinks
he is seeing. Is the mask covering all the hole surface? Hope this
helps.

Regards

Alistair

Alistair F Murray   MICT
Technical Manager
Artetch Circuits Limited
England UK
Direct Dial: 01903-712931

www.artetch.co.uk 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fran Juliot
Sent: 06 March 2007 15:58
To: [log in to unmask]
Subject: [TN] immersion silver and exposed copper in small vias

Our customer is questioning what they feel is exposed copper in 8 mil
vias holes on silver boards.  We feel there is mask residue in the holes
which does not allow silver to take.  These are holes that are allowed
to be plugged.  Has anyone else ran into this issue with thier customers
and do you have the same look or are your small vias covered with silver
all the way through the via?  

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