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June 2014

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Subject:
From:
Reuven Rokah <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Reuven Rokah <[log in to unmask]>
Date:
Mon, 2 Jun 2014 22:29:54 +0300
Content-Type:
text/plain
Parts/Attachments:
text/plain (137 lines)
Hi Gil,

It seems a component plating failure.
Try to check what is the difference between this capacitor and other one
with good performance.
It seems your problematic cap. have grainy structure plating which that
suck the solder during the solder joint.
Try to work with 220 deg C.


On Mon, Jun 2, 2014 at 6:12 PM, Zilber Gil <[log in to unmask]> wrote:

>  XRF was done on a new part before reflow. Before reflow the surface was
> shine. After reflow it was grayed and porous as seen in the picture.
> Thanks,
>
> Gil
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> Sent: Monday, June 02, 2014 6:06 PM
> To: [log in to unmask]
> Subject: Re: [TN] Capacitor - strange soldering behavior
>
> Would XRF plating alloy identification work here on a loose part?
>
> Victor,
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David Hillman
> Sent: Monday, June 02, 2014 9:36 AM
> To: [log in to unmask]
> Subject: Re: [TN] Capacitor - strange soldering behavior
>
> Hi Gil - two questions: (1) Does the capacitor have a barrier layer of
> copper or nickel to prevent the underlying metallization from leaching into
> the solder joint?; (2) Have you completed a cross section to assess the
> solder joint microstructure?
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
> On Thu, May 29, 2014 at 9:01 AM, Zilber Gil wrote:
>
> > Hello Technet,
> >
> > While soldering this ceramic capacitor (
> > http://ipc-technet.groupsite.com/gallery/27235), its looks like that
> > the capacitor suck the solder from the PCB`s pad to the capacitor pad
> > and the color is now grayish and porosity. XRF found Sn, Pb, Cu on the
> > capacitor pad. PCB Solderability was good and the profile was SnPb at
> > 225 deg C under Nitrogen. Other capacitors and components on the board
> > look normal with shine soldering.
> > Can anybody seen something like that before? Any ideas?
> >
> > Thanks and have a wonderful weekend.
> >
> > Dr. Gil Zilber
> > Technologist, Elta system Ltd.
> >
> >
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> >
> > Thank you.
> >
> >
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-- 

Best Regards,

*Reuven Rokah*

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