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August 2010

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Subject:
From:
Ioan Tempea <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ioan Tempea <[log in to unmask]>
Date:
Thu, 12 Aug 2010 14:00:34 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (224 lines)
Hetal,

I don't really see the connection between potting and wave corrosion?

I think you were better off starting your own thread.

We need to keep the forum easy to follow.

Thanks,

Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer
T | 450.967.7100 ext.244
E | [log in to unmask] 
W | www.digico.cc

N'imprimer que si nécessaire - Print only if you must

-----Message d'origine-----
De : Hetal Shah [mailto:[log in to unmask]] 
Envoyé : August-12-10 1:55 PM
À : [log in to unmask]
Objet : Re: [TN] Wave Corrosion

Hi,
One of our customer  have an RF Transmitter on the PCB. they have a couple
of concerns.
 One that the potting material will damage the components and the other that
the potting material will shield the RF Transmissions of their transmitter.

Their assembly house was going to use our 2 parts Epoxy (which conatains
Calcined alumina) as the potting material.  Will this create any of the
problems mentioned?

Any insight into this matter would greatly be appreciated.

Thank you
Hetal Shah
R & D Chemist
MG Chemicals

On Thu, Aug 12, 2010 at 10:33 AM, John Goulet <[log in to unmask]> wrote:

> The coating is good if the recommended PM procedures are followed.
>  The people that maintain the lead-free systems are told that they can no
> longer use spatulas to scrape the solder pot and implellars clean. They are
> supposed to use horse hair brushes to prevent damaging the coating.
>
> ----- Original Message -----
> From: Rex Waygood <[log in to unmask]>
> To: [log in to unmask]
> Sent: Fri, 06 Aug 2010 14:26:48 -0000 (UTC)
> Subject: Re: [TN] Wave Corrosion
>
> Ti = Fit & Forget
>
> That is the replacement!
> :-)
> Rex
>
> Sent by me
>
> On 6 Aug 2010, at 14:13, "[log in to unmask]" wrote:
>
> >
> > Hi Rex - it appears that the Melonite coating was compromised. I know
> that Ti is more expensive but it has been shown to handle the degradation by
> molten tin much better. Something to consider.
> >
> > Dave Hillman
> > Rockwell Collins
> > [log in to unmask]
> >
> >
> > Rex Waygood
> > Sent by: TechNet
> > 08/06/2010 06:47 AM
> >
> > Please respond to
> > TechNet E-Mail Forum ; Please respond to
> > Rex Waygood
> >
> > To
> > [log in to unmask]
> > cc
> > Subject
> > Re: [TN] Wave Corrosion
> >
> >
> >
> >
> >
> > I forgot to say the impeller was a retrofit on the machine.
> > Rex
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
> > Sent: 06 August 2010 12:14
> > To: [log in to unmask]
> > Subject: Re: [TN] Wave Corrosion
> >
> > Ummm
> > The website crashed just after I put the images up, obviously the site
> > didn't like my pictures either.
> > As far as I know the surface treatment used is Melonite QPQ.
> > Regards
> > Rex
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> > Sent: 06 August 2010 12:09
> > To: [log in to unmask]
> > Subject: Re: [TN] Wave Corrosion
> >
> > Hi Rex!
> >
> > Your link appears to be broken. I would have liked to seen the photos.
> > Was the machine brand new or was it retrofitted to be lead free
> > compatible? Do you know what the impeller was made of? Or was it coated
> > to protect it from high tin content solder?
> >
> > Steve
> >
> >
> >
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