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dvanlanen
Joined: 25 Jul 2006
Posts: 122
Location: Madison, WI
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 Posted: Wed May 28, 2008 7:31 am Post subject: Corrosion Protection Of Electrical Connections |
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I was wondering if there was any sort of recommended corrosion protection application for electrical connections, especially where wires are spliced with solder or d-sub pin connectors and then covered with heat shrink tubing.
I found the attached e-mail in the archive, but it refers only to limited use of DC-4 silicone grease for certain situations such as spark plug terminals. Is there any other sort of material that folks are applying to connections as added protection before “covering them up”, or is it best just to leave them “dry” and simply use dual-wall heat shrink where there is a concern about corrosion?
Thanks,
Dave Van Lanen
Madison, WI
------------------------
Date: May 14, 2006
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Subject: Re: Di-Electric Grease; where used
>
>My other toy is a motorcycle, which has electronic everything. Some =
>riders strongly advocate to apply dielectric grease the connectors for =
>corrosion protection. But a dielectric is a non-conductor; seem =
>counter-productive. What am I missing here?
>Wayne
Dow-Corning DC-4 and similar silicone greases are
excellent prophylactic treatments for exclusion of
moisture and other contaminants into connectors.
Waaaayyyy back when, we commonly filled the mating
spaces of coax connectors up on towers with DC-4 before
putting the connector together. Use sparingly. You don't
want it to ooze out and get the exterior all messy. The
stuff is VERY hard to get off and in the case of coax
connections, made it difficult to wrap with tape for
exterior water-barrier.
A coating the top insulator and terminal of a spark
plug before installing the spark plug wire would be
an assist for keeping moisture out of a potentially
vulnerable joint in the system. Same thing would be
good for coil end of wire.
Silicone greases migrate with time. Put a pea-sized
dab on a flat surface and come back a few months later.
You'll find a large silicone-grease wetted area around the
dab that continues to grow with time.
It's a neat stuff but I would use it reservedly with
respect to amount and location and only in areas where
a connection is likely to be exposed to extra-ordinarily
corrosive influences.
Bob . . .
[quote][b]
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longg(at)pjm.com
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| Posted: Wed May 28, 2008 8:26 am Post subject: Corrosion Protection Of Electrical Connections |
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Dave,
Bob has earlier indicated to me that hanging connections out in the open is the best protection of all. Look over your head at those 500KV lines. If they get wet, they'll dry without inhibitors which cover up moisture etc. If you live in a pathetically damp place like I do, I have another trick to help the moisture/corrosion problem. This works in the cabin or in the engine compartment. Take a 25 watt bulb and hang it inside the engine compartment or the cabin when not in use. This very small amount of heat will thwart normal moisture buildup.
There is at least one product out there that connects to the airframe and produces positive ions in and around the airplane which supposedly are offensive to rust. I heard they also attract nice women, but who knows.
Glenn
--
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klehman(at)albedo.net
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| Posted: Wed May 28, 2008 10:26 am Post subject: Corrosion Protection Of Electrical Connections |
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Oh now you've stepped in it Glenn 
And I'm about to... Every decade or so the ion rust protection scam
reappears. Even new car dealers are in on it this time. If only cathodic
protection were so easy...
Ken
longg(at)pjm.com wrote:
| Quote: | Dave,
Bob has earlier indicated to me that hanging connections out in the
open is the best protection of all. Look over your head at those 500KV
lines. If they get wet, they'll dry without inhibitors which cover up
moisture etc. If you live in a pathetically damp place like I do, I have
another trick to help the moisture/corrosion problem. This works in the
cabin or in the engine compartment. Take a 25 watt bulb and hang it
inside the engine compartment or the cabin when not in use. This very
small amount of heat will thwart normal moisture buildup.
There is at least one product out there that connects to the airframe
and produces positive ions in and around the airplane which supposedly
are offensive to rust. I heard they also attract nice women, but who knows.
Glenn
|
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