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October 2005

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TechNet E-Mail Forum <[log in to unmask]>, Colin McVean <[log in to unmask]>
Date:
Fri, 14 Oct 2005 12:39:10 -0400
Reply-To:
TechNet E-Mail Forum <[log in to unmask]>, "Fineline Circuits, Inc" <[log in to unmask]>
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"Fineline Circuits, Inc" <[log in to unmask]>
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Colin:
2-3 years back we ran an experiment with a tin vendor where we did
electrolytic tin plate, etch, and mask.Tin was supposed to be the final
finish per vendor.Vendor told us that he had customers that did this.
However the tin got tarnished and dark grey after cure and we just did not
like the look off the final finish. We did not pursue it further.
Sona

----- Original Message -----
From: "Colin McVean" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, October 14, 2005 10:33 AM
Subject: Re: [TN] Electrolytic Tin Plating


Are you suggesting that you use the tin plate as your final finish? I'm
no chemist, but I think that could spell trouble, with the open
structure of the electroplated tin giving rise to whiskers.
We use Electroplated tin, but only for the etch resist application - we
strip it off, solder mask, then final finish, either Immersion Silver,
Immersion Ni/Au, or lead free HASL dependant on customer requirements.

Colin McVean M.Inst.C.T.
Production Manager
Artetch Circuits Limited
Main: 01903 725365
DD:    01903 712926
Email: [log in to unmask]
www.artetch.co.uk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fineline Circuits,
Inc
Sent: 14 October 2005 15:20
To: [log in to unmask]
Subject: [TN] Electrolytic Tin Plating

Hi Technetters:
Now that Leadfree is here or close to, we would like to change the
electrolytic tinlead plating tank to electrolytic tin tank.
I would like to know if the other fab houses have done this and if so
which
vendors tin chemistry has a wider window of operation. Are they seeing
any
tin whiskers/sliver problems etc..especially if the boards are stored
for
few months.
Also it is my understanding that you can mask over this plated tin since
it
does not flow. In this case you can totally avoid stripping the tin and
tin
levelling.
We currently do offer other finishes including electroless tin ,
immersion
nickel/gold, silver....
If there are other consideration in making this change I would
appreciate
your input.
Franklin, like you I would like to see more fab houses participating but
I
would like to remain with technet.
Thanks

Sona Sitapara
Fineline Circuits Inc.

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