I noticed a rather unusual corrosion-related electronics failure on
Monday evening. My husband and I were having dinner at a local
restaurant, and the man sitting next to us was cleaning corrosion off a
game plug-in from his 7 year old son's Gameboy, so I asked if I could look
at it. Gold contacts with green corrosion products, little plastic ridges
between the contacts. The boy would put the plug-ins in his mouth, then
put the plug-in in the device, and this would result in galvanic and
electrolytic corrosion.
I told the boy not to put his games in his mouth because it spoiled them,
and told his father to try a soft paint brush and rubbing alcohol at home.
I think this one is stranger than Bev's Blackberry failures,
Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069
From: Victor Hernandez <[log in to unmask]>
To: [log in to unmask]
Date: 09/10/2010 08:52 AM
Subject: Re: [TN] humid environments and long term reliability
Sent by: TechNet <[log in to unmask]>
Chris,
What is the 760G product? Dielectric grease!
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris BALL
Sent: Friday, September 10, 2010 7:48 AM
To: [log in to unmask]
Subject: Re: [TN] humid environments and long term reliability
" I have several HP calculators that used to be intermittant (battery
contacts) until I took a q-tip and applied 760G on them. Also several
flashlights and the trailer hitch on my Volvo wagon."
...must be one hell of a q-tip....
:-)
Chris
On Sat, Aug 28, 2010 at 1:31 PM, Bob Landman
<[log in to unmask]>wrote:
> Carl,
>
> We had a problem years ago with Molex/Amp tin-plated power connectors
> (0.156" spacing). We traced the problem to corrosion (we could see the
> discoloration on the pins caused by the humid enviroment + airborne
> contaminants). We contacted Molex who recommended Nye Lubricants Nyogel
> 760G connector lubricant.
>
> At the time I happened to be visiting Henning Leidecker and Jay Brusse
at
> NASA Goddard Space Flight Center so asked them for advice. I was
advised to
> read the following paper.
>
> http://www.agingaircraftconference.org/all_files/20/20c/123_doc.pdf
>
> That convinced us we were on the right track (we had been concerned it
was
> a circuit design or component problem as the falures were random).
>
> We sent the client a tube of 760G which he applied to over 200 of our
units
> in 2007. The problem (intermittant power failure) vanished.
> www.nyelubricants.com We now apply 760G to all our tin-plated
> connectors. Also some gold plated connectors (RJ-45 type) as we found
in
> some environments (like sewage treatment plants) the atmosphere quickly
> finds and corrodes the tiny pinholes in the gold flash coating. Unless
the
> mfg plates a very thick gold coating, you can expect such imperfections
to
> corrode. The result is a greenish tarnish which is an insulator. I
have
> several HP calculators that used to be intermittant (battery contacts)
until
> I took a q-tip and applied 760G on them. Also several flashlights and
the
> trailer hitch on my Volvo wagon.
>
> Regards,
>
> Bob Landman
> H&L Instruments, LLC
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl VanWormer
> Sent: Monday, August 23, 2010 1:53 PM
> To: [log in to unmask]
> Subject: [TN] humid environments and long term reliability
>
> We are considering conformal coating our boards that will go into a
chassis
> that may be an occasional high humidity environment. I have been told
that
> the humidity (and water) is "slowed down" by the conformal coating, and
that
> good cleaning before the conformal coating is essential for reliability.
> Assuming we have done all we can do for the PC board assembly, my worry
> goes to the next level; the cables that connect between boards and also
to
> the valves, relays, and sensors. Is it worth considering messing up the
> system with silicone grease smeared on all of the 2-pin, 5-pin, and 50
pin
> (IDC) plugs and sockets? I know some of the cute little phone-wire
crimp-on
> IDC button connectors are filled with a dielectric grease, so it must
have
> some value. And what about the IDC connector, with its pins just
piercing
> the ribbon cable .
> . . Is there a long term reliability problem there, too?
>
>
>
> I'm looking for "fatherly guidance" on making a system that won't ever
need
> a field service call.
>
>
>
> Thanks for tolerating my paranoia,
>
> Carl
>
>
>
>
>
>
>
> Carl Van Wormer, P.E., AE7GD
>
> Senior Hardware Engineer
>
> Cipher Systems
>
> 1800 NW 169th Place, Suite B-100
>
> Beaverton, OR 97006
>
> Cipher Systems (503) 617-7447 x 5163
>
> Direct Line (503) 425-5163
>
> [log in to unmask]
>
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