Fabien,
If you are going to do destructive analysis I would recommend cutting the board close to a PTH and then use fine sand paper and grind into the PTH to expose the plating on the back wall of the PTH (i.e., make what looks like a castellation) and then do XRF measurements on the PTH barrel just like you would on the surface.
Regards,
George
George M. Wenger
Andrew Solutions
Senior Principal FMA/Reliability Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 (Office) (732) 309-8964 (cell)
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of vladimir Igoshev
Sent: Friday, September 17, 2010 10:36 AM
To: [log in to unmask]
Subject: Re: [TN] How to measure thickness of ENIG plating inside the via barrel
That is what we do for living :-)
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: Gerald Gagnon <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Fri, 17 Sep 2010 10:26:52
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
Gerald Gagnon <[log in to unmask]>
Subject: Re: [TN] How to measure thickness of ENIG plating inside the via barrel
Vladimir is absolutely correct.
However, I will add that softer gold sandwiched between two hard nickel layers requires good sectioning skill and technique.
ENIG gold is 2-5 microinches in thickness (per IPC) so you will not only need good technique but good quality optics as well.
Brs - Gerry
> Date: Fri, 17 Sep 2010 11:44:06 +0000
> From: [log in to unmask]
> Subject: Re: [TN] How to measure thickness of ENIG plating inside the via barrel
> To: [log in to unmask]
>
> Section will do it. Keep in mind though, that the board would have to be overplated with another layer of E-Ni to prevent Au smearing during polishing.
> Vladimir
>
> SENTEC Testing Laboratory Inc.
> 11 Canadian Road, Unit 7.
> Scarborough, ON M1R 5G1
> Tel: (416) 899-1882
> Fax: (905) 882-8812
> www.sentec.ca
>
> -----Original Message-----
> From: Fabien Guizelin <[log in to unmask]>
> Sender: TechNet <[log in to unmask]>
> Date: Fri, 17 Sep 2010 07:14:09
> To: <[log in to unmask]>
> Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
> Fabien Guizelin <[log in to unmask]>
> Subject: [TN] How to measure thickness of ENIG plating inside the via barrel
>
> Hi
>
> IPC-4552 calls for XRF to measure ENIG plating thickness. But, this method can only be applied to surface pads. How can we assess the quality of the plating in via barrel ? (poor plating would compromise mechanical strength and resistance to corrosion)
>
> Thanks for your insight
>
> Fabien
>
>
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