Today's Message Index:
----------------------
1. 12:13 AM - Re: Anti Corrosive Zinc Paste (John MacCallum)
2. 05:09 AM - Re: Anti Corrosive Zinc Paste (ROGER & JEAN CURTIS)
3. 06:11 AM - Re: Anti Corrosive Zinc Paste (Eric M. Jones)
4. 06:58 AM - Re: Re: Ignition Interference (Richard Girard)
5. 10:49 AM - Re: Anti-corrosive paste (D L Josephson)
6. 11:05 AM - Re: Re: Anti-corrosive paste (Mike Wynn)
7. 12:22 PM - Re: Re: Anti-corrosive paste (Bill)
8. 01:19 PM - Re: Re: Anti-corrosive paste ()
9. 04:37 PM - Re: Re: Anti Corrosive Zinc Paste (Henador Titzoff)
10. 04:45 PM - Re: Re: Anti-corrosive paste (Henador Titzoff)
Message 1
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Subject: | Anti Corrosive Zinc Paste |
I used Penetrox on a 9El Log Periodic for 13-29 mhz and also on 2 x 13 EL
Long Boom 2m Yagis. Up in the Air for about 5 years.
The joints out lasted the feedlines after the White Cockatoos got them L
Cheers
John MacCallum
RV10 41016
VH-DUU
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bob
McCallum
Sent: Friday, 18 May 2012 9:00 AM
Subject: RE: AeroElectric-List: Anti Corrosive Zinc Paste
Henador;
Bear in mind that both of the proprietary products you mention are
specifically manufactured for preventing the corrosion of Aluminium wiring
connections so they should be particularly effective at keeping oxygen out
of the joint. When making crimped connections on Aluminium Hydro
transmission lines the process was to strip the insulation, brush the
conductors bright with a stainless steel brush, dip the wire into the pot of
Penetrox, and then install the connector with a hydraulic crimper. Never
heard of a failure of any joints done this way even in the rather harsh
environment of the mining industry.
Bob McC
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Henador
Titzoff
Sent: Thursday, May 17, 2012 3:01 PM
Subject: AeroElectric-List: Anti Corrosive Zinc Paste
Hi People,
I would like to know what opinions you have on anti-corrosive zinc paste to
make our connections more reliable. Below is a link to an article on how
ACZP helps make better connections by supplying sacrificial zinc ions to
stop or decrease corrosion at the push on connector's mechanical linkage,
which actually supplies the electrical connection. The two pastes he
mentions, Burndy Penetrox and Ideal Noalox, seem to do the job but are
either too far on the right or left when it comes to consistency. Do you
guys think that ACZP will help with our normal push on connectors that we
use in aviation, and/or do you have a product recommendation that is better
than these two products? I do have an application to wire lights on a large
road trailor, and I would like to use ACZP on those connections, since road
surfaces can be covered with all sorts of nasty corrosive substances.
Perhaps a ACZP can have a good application there to keep out all the
nasties. What do you guys think? Eric, you're pretty good on surfaces
corroding. What do you think? You, too, Bob.
http://sw-em.com/anti_corrosive_paste.htm
Thanks.
Henador Titzoff
http://www.matronics.com/Navigator?AeroElectric-List
http://forums.matronics.com
http://www.matronics.com/contribution
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Subject: | Anti Corrosive Zinc Paste |
The joints out lasted the feedlines after the White Cockatoos got them L
Over the years I have lost a lot of sleep, wondering if the Cockatoos,
especially
The White ones, were eating my radio antenna feed lines. So far I have
seen no
Signs of damage from the critters, but I will continue to be vigilant
and keep
My aircraft locked at all times to be safe. =98=BA =98=BA
=98=BA
Roger
Do Not Archive
Message 3
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Subject: | Re: Anti Corrosive Zinc Paste |
Henador;
As Bob and others have said, ACZP, which is probably zinc oxide + silicone grease,
has the merits of keeping environmentals out of the joint while also transferring
heat. The glop used to stick your microprocessor to its heat sink is usually
zinc oxide/silicone grease.
Many substances make good electrical joint sealant, and yes, putting insulating
grease on a conductive joint makes perfect sense, since the grease only replaces
existing insulating air gaps. Sometimes people use silver paste, but not because
it's electrically conductive--silver is a better heat conductor.
Why any notion of zinc being "sacrificial" comes up is beyond me. You certainly
wouldn't want to use it if it was.
The only reason not to use it is that it is messy. Otherwise it would be everywhere.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=373289#373289
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Subject: | Re: Ignition Interference |
If " When a handheld is swapped out for the V6, it does just fine" means
that it doesn't repeat any of the faults of the MGL radio, get an RA number
and send the MGL back to the manufacturer to have it fixed or replaced.
Rick Girard
On Thu, May 17, 2012 at 8:46 PM, messydeer <messydeer@yahoo.com> wrote:
>
> My SWR's all came in less than 2.1, thank Gawd! But wait, there's more.
> Here's what I posted on the MGL forum:
>
> While trying to sort out my ignition noise issues, I had some odd things
> happen with my V6.
>
> To isolate everything I could, the only wires connected to the V6 are the
> 4 audio jacks (which are for sure isolated from the panel), the ground
> (goes directly to the negative of a separate battery ), the supply
> (separate battery), and the antenna on top of the tailcone.
>
> The V6 is located in the middle of my Sonex panel, ~2' off the floor, 2'
> behind the firewall. I turn it on and get good reception. Start the engine
> and the reception vanishes. I can't even get the blasted ignition noise.
> Rebooting the V6 with the engine running doesn't do anything. Kill the
> engine and there's still no reception. Adjusting the squelch does nothing.
> And this is with the engine turned off after having run for a minute. The
> only thing that lets the V6 get reception again is to reboot it AFTER the
> engine is off.
>
> The antenna, when installed, did not have a ground fault. When a handheld
> is swapped out for the V6, it does just fine. Even if the antenna had a
> ground fault to the airframe, could that cause the V6 to lose reception?
> There's no ground route back to the V6. If so, then why doesn't the
> handheld behave the same way when it is connected to the same antenna? It
> works just fine with the same cable and antenna.
>
> Next time I'm at the airport, I'll connect a portable antenna to make sure
> there's no ground problem. Any other suggestions?
>
> --------
> Dan
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=373257#373257
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 5
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Subject: | Re: Anti-corrosive paste |
On 5/17/12 11:57 PM, AeroElectric-List Digest Server wrote:
> Hi People,=0A=0AI would like to know what opinions you have on
> anti-corrosi ve zinc paste to make our connections more reliable.
> -Below is a link to an article on how ACZP helps make better
> connections by
Bob has explained thoroughly about what's happening here. Let's go a
few steps further. The idea is to make the metal-to-metal contact area
of the conductors as large as possible by forming them into each other,
and to exclude any contaminants that might get between the metals. Any
nonconductive contaminant reduces the size of the contact area, which
increases the resistance. Most troublesome are oxides and salts of the
metals, which occur when air, water and other chemicals eventually
convert the metal to something else, producing a barrier between the two
parts. Zinc chromate paste excludes water to some extent but its main
function is to combine chemically with *aluminum* to produce a thin
chemical film that is conductive, and to prevent the formation of
aluminum oxides which are not. I don't know whether any such reaction
occurs with copper, I haven't seen "ACZP" used for this purpose.
The idea of using a grease like silicone (DC4) is based entirely on
excluding air and water. Silicone grease is used on microwave and RF
connections because it doesn't badly compromise the dielectric constant
of insulators it gets on. But for DC, any ordinary grease will do; it
also lubricates the parts as they are being crushed by the wrench or
crimper, so they can conform to each other's surfaces more readily. The
very best grease for this purpose has been used for nearly 100 years for
all kinds of high current applications by the telephone company, but it
seems to be a secret in the light aviation industry. I first learned of
it at a helicopter battery shop where they made their own version, with
a little more solvent added so it could be painted on. It's cheap and
readily available. It's a combination of petroleum grease, some waxes to
make it stiff and some amines to make it penetrate into joints and
spread throughout the voids in the contact over time. It is closely
related to "cosmoline" and is called No-Ox-Id "A Special" made since the
early 1910s by Sanchem in Chicago. A big tube of it sells on eBay for
about $10 but you can buy cases of 24 at less than $5 apiece. You can
see the various other versions of No-Ox-Id on their site. A-Special is
thinned out a little so it can be squeezed out of a tube (if the tube is
a little warm.) You only need a very thin film but you can coat all the
metal parts with this, clamp them together and you're done.
I have taken apart telephone company installations more than 50 years
old that had this stuff in all their joints and there has never been any
corrosion. Many fleet operators use it on battery posts and terminals to
keep the lead from corroding, you can even massage it into the joint
between the post and the battery case to slow down the battery acid
vapors from getting to the post that way. I started using it on aircraft
and automotive things about 30 years ago and it just works.
--
David Josephson
Message 6
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Subject: | Re: Anti-corrosive paste |
Thanks for an extremely helpful reply on the subject of pastes.
It's time to add another goody to the tool box!
M. Wynn/A&P, LNC2 bld'r.
*********
----- Original Message -----
From: "D L Josephson" <dlj04@josephson.com>
Sent: Friday, May 18, 2012 11:45 AM
Subject: AeroElectric-List: Re: Anti-corrosive paste
> <dlj04@josephson.com>
>
> On 5/17/12 11:57 PM, AeroElectric-List Digest Server wrote:
>> Hi People,=0A=0AI would like to know what opinions you have on
>> anti-corrosi ve zinc paste to make our connections more reliable. -Below
>> is a link to an article on how ACZP helps make better connections by
> Bob has explained thoroughly about what's happening here. Let's go a few
> steps further. The idea is to make the metal-to-metal contact area of the
> conductors as large as possible by forming them into each other, and to
> exclude any contaminants that might get between the metals. Any
> nonconductive contaminant reduces the size of the contact area, which
> increases the resistance. Most troublesome are oxides and salts of the
> metals, which occur when air, water and other chemicals eventually convert
> the metal to something else, producing a barrier between the two parts.
> Zinc chromate paste excludes water to some extent but its main function is
> to combine chemically with *aluminum* to produce a thin chemical film that
> is conductive, and to prevent the formation of aluminum oxides which are
> not. I don't know whether any such reaction occurs with copper, I haven't
> seen "ACZP" used for this purpose.
>
> The idea of using a grease like silicone (DC4) is based entirely on
> excluding air and water. Silicone grease is used on microwave and RF
> connections because it doesn't badly compromise the dielectric constant of
> insulators it gets on. But for DC, any ordinary grease will do; it also
> lubricates the parts as they are being crushed by the wrench or crimper,
> so they can conform to each other's surfaces more readily. The very best
> grease for this purpose has been used for nearly 100 years for all kinds
> of high current applications by the telephone company, but it seems to be
> a secret in the light aviation industry. I first learned of it at a
> helicopter battery shop where they made their own version, with a little
> more solvent added so it could be painted on. It's cheap and readily
> available. It's a combination of petroleum grease, some waxes to make it
> stiff and some amines to make it penetrate into joints and spread
> throughout the voids in the contact over time. It is closely related to
> "cosmoline" and is called No-Ox-Id "A Special" made since the early 1910s
> by Sanchem in Chicago. A big tube of it sells on eBay for about $10 but
> you can buy cases of 24 at less than $5 apiece. You can see the various
> other versions of No-Ox-Id on their site. A-Special is thinned out a
> little so it can be squeezed out of a tube (if the tube is a little warm.)
> You only need a very thin film but you can coat all the metal parts with
> this, clamp them together and you're done.
>
> I have taken apart telephone company installations more than 50 years old
> that had this stuff in all their joints and there has never been any
> corrosion. Many fleet operators use it on battery posts and terminals to
> keep the lead from corroding, you can even massage it into the joint
> between the post and the battery case to slow down the battery acid vapors
> from getting to the post that way. I started using it on aircraft and
> automotive things about 30 years ago and it just works.
>
> --
> David Josephson
>
>
>
Message 7
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Subject: | Re: Anti-corrosive paste |
Hi David -
This sounds similar in application to Par-Al-Ketone - used on aircraft
flight and engine control cables. Do you know of this product, and is it
similar No-Ox-Id?
See Wick's offering below:
http://www.wicksaircraft.com/catalog/product_cat.php/subid=10183/index.html
Bill
SF bay area
On Fri, May 18, 2012 at 10:45 AM, D L Josephson <dlj04@josephson.com> wrote:
> dlj04@josephson.com>
>
> On 5/17/12 11:57 PM, AeroElectric-List Digest Server wrote:
>
>> Hi People,=0A=0AI would like to know what opinions you have on
>> anti-corrosi ve zinc paste to make our connections more reliable. -Below is
>> a link to an article on how ACZP helps make better connections by
>>
> Bob has explained thoroughly about what's happening here. Let's go a few
> steps further. The idea is to make the metal-to-metal contact area of the
> conductors as large as possible by forming them into each other, and to
> exclude any contaminants that might get between the metals. Any
> nonconductive contaminant reduces the size of the contact area, which
> increases the resistance. Most troublesome are oxides and salts of the
> metals, which occur when air, water and other chemicals eventually convert
> the metal to something else, producing a barrier between the two parts.
> Zinc chromate paste excludes water to some extent but its main function is
> to combine chemically with *aluminum* to produce a thin chemical film that
> is conductive, and to prevent the formation of aluminum oxides which are
> not. I don't know whether any such reaction occurs with copper, I haven't
> seen "ACZP" used for this purpose.
>
> The idea of using a grease like silicone (DC4) is based entirely on
> excluding air and water. Silicone grease is used on microwave and RF
> connections because it doesn't badly compromise the dielectric constant of
> insulators it gets on. But for DC, any ordinary grease will do; it also
> lubricates the parts as they are being crushed by the wrench or crimper, so
> they can conform to each other's surfaces more readily. The very best
> grease for this purpose has been used for nearly 100 years for all kinds of
> high current applications by the telephone company, but it seems to be a
> secret in the light aviation industry. I first learned of it at a
> helicopter battery shop where they made their own version, with a little
> more solvent added so it could be painted on. It's cheap and readily
> available. It's a combination of petroleum grease, some waxes to make it
> stiff and some amines to make it penetrate into joints and spread
> throughout the voids in the contact over time. It is closely related to
> "cosmoline" and is called No-Ox-Id "A Special" made since the early 1910s
> by Sanchem in Chicago. A big tube of it sells on eBay for about $10 but you
> can buy cases of 24 at less than $5 apiece. You can see the various other
> versions of No-Ox-Id on their site. A-Special is thinned out a little so it
> can be squeezed out of a tube (if the tube is a little warm.) You only need
> a very thin film but you can coat all the metal parts with this, clamp them
> together and you're done.
>
> I have taken apart telephone company installations more than 50 years old
> that had this stuff in all their joints and there has never been any
> corrosion. Many fleet operators use it on battery posts and terminals to
> keep the lead from corroding, you can even massage it into the joint
> between the post and the battery case to slow down the battery acid vapors
> from getting to the post that way. I started using it on aircraft and
> automotive things about 30 years ago and it just works.
>
> --
> David Josephson
>
>
Message 8
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Subject: | Re: Anti-corrosive paste |
Isn't that how they market dialectic grease available for $2 at Home Depot? That
will likely work for the electrical parts you can access which means the electrical
parts will outlast the rest of the airplane - for the body you simply
take out all of the rivets between the non-compatible parts and puts some grease
in there and rivet them back together. Good luck inside the wings. When your
AP tells you your wing is rotting inside out from the same problem, have a
check ready. Oh, and you do realize on older airplanes the wire covering will
rot and short out only while you are flying at night before the connectors oxidize.
When the skin comes off that big breaker wire in the panel on the old jobs,
it's a real light show.
I'm sticking with carbon/fiberglass for the body. When I'm gone the wife can use
it as a lawn ornament. The Buss panels you buy from B&C will probably last longer
than you own your airplane. If not, they are < $20 to replace. If you smoke
and would buy electrical parts each day instead of cigarettes, you could replace
all the parts every weekend :)
They also sell a kit that will charge - ions with + 1's to stave the rust advance
- I've no idea if that swamp land idea works. Since many folks use some kind
of battery tender anyway you can run a cord with a 25 watt bulb attached and
hang it in your avionics bay. Cheapest insurance available. Of course you can
also move to Arizona and just park in the field under an umbrella. Be sure to
disconnect the light bulb before you fly away.
Have a great weekend everybody,
Glenn
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Sent: Friday, May 18, 2012 3:18 PM
Subject: Re: AeroElectric-List: Re: Anti-corrosive paste
Hi David -
This sounds similar in application to Par-Al-Ketone - used on aircraft flight and
engine control cables. Do you know of this product, and is it similar No-Ox-Id?
See Wick's offering below:
http://www.wicksaircraft.com/catalog/product_cat.php/subid=10183/index.html
Bill
SF bay area
On Fri, May 18, 2012 at 10:45 AM, D L Josephson <dlj04@josephson.com> wrote:
> dlj04@josephson.com>
>
> On 5/17/12 11:57 PM, AeroElectric-List Digest Server wrote:
>
>> Hi People,=0A=0AI would like to know what opinions you have on
>> anti-corrosi ve zinc paste to make our connections more reliable.
>> -Below is a link to an article on how ACZP helps make better
>> connections by
>>
> Bob has explained thoroughly about what's happening here. Let's go a
> few steps further. The idea is to make the metal-to-metal contact area
> of the conductors as large as possible by forming them into each
> other, and to exclude any contaminants that might get between the
> metals. Any nonconductive contaminant reduces the size of the contact
> area, which increases the resistance. Most troublesome are oxides and
> salts of the metals, which occur when air, water and other chemicals
> eventually convert the metal to something else, producing a barrier between the
two parts.
> Zinc chromate paste excludes water to some extent but its main
> function is to combine chemically with *aluminum* to produce a thin
> chemical film that is conductive, and to prevent the formation of
> aluminum oxides which are not. I don't know whether any such reaction
> occurs with copper, I haven't seen "ACZP" used for this purpose.
>
> The idea of using a grease like silicone (DC4) is based entirely on
> excluding air and water. Silicone grease is used on microwave and RF
> connections because it doesn't badly compromise the dielectric
> constant of insulators it gets on. But for DC, any ordinary grease
> will do; it also lubricates the parts as they are being crushed by the
> wrench or crimper, so they can conform to each other's surfaces more
> readily. The very best grease for this purpose has been used for
> nearly 100 years for all kinds of high current applications by the
> telephone company, but it seems to be a secret in the light aviation
> industry. I first learned of it at a helicopter battery shop where
> they made their own version, with a little more solvent added so it
> could be painted on. It's cheap and readily available. It's a
> combination of petroleum grease, some waxes to make it stiff and some
> amines to make it penetrate into joints and spread throughout the
> voids in the contact over time. It is closely related to "cosmoline"
> and is called No-Ox-Id "A Special" made since the early 1910s by
> Sanchem in Chicago. A big tube of it sells on eBay for about $10 but
> you can buy cases of 24 at less than $5 apiece. You can see the
> various other versions of No-Ox-Id on their site. A-Special is thinned
> out a little so it can be squeezed out of a tube (if the tube is a
> little warm.) You only need a very thin film but you can coat all the metal parts
with this, clamp them together and you're done.
>
> I have taken apart telephone company installations more than 50 years
> old that had this stuff in all their joints and there has never been
> any corrosion. Many fleet operators use it on battery posts and
> terminals to keep the lead from corroding, you can even massage it
> into the joint between the post and the battery case to slow down the
> battery acid vapors from getting to the post that way. I started using
> it on aircraft and automotive things about 30 years ago and it just works.
>
> --
> David Josephson
>
>
Message 9
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Subject: | Re: Anti Corrosive Zinc Paste |
Thank you for weighing in, Eric.- When attaching connectors to wires in
=0Aavionics and automotive applications, there isn't a need for increasing
=0Aheat transfer, so zinc is not needed.- A simple dielectric grease is
=0Asufficient, you say.- This is pretty much what Bob says, so I'll run
=0Awith it.=0A=0AThere are several posts from people about this, and I see
two more that I=0A haven't read.- Let me see what they say and hopefully
one of them will stand out on a recommended good grease at a good price and
readily available.=0A=0AThanks,=0A=0A-=0AHenador Titzoff=0A=0A=0A_______
_________________________=0A From: Eric M. Jones <emjones@charter.net>=0ATo
: aeroelectric-list@matronics.com =0ASent: Friday, May 18, 2012 9:07 AM=0AS
ubject: AeroElectric-List: Re: Anti Corrosive Zinc Paste=0A =0A--> AeroElec
tric-List message posted by: "Eric M. Jones" <emjones@charter.net>=0A=0AHen
ador; =0A=0AAs Bob and others have said, ACZP, which is probably zinc oxide
nt while also transferring heat. The glop used to stick your microprocessor
to its heat sink is usually zinc oxide/silicone grease.=0A=0AMany substanc
es make good electrical joint sealant, and yes, putting insulating grease o
n a conductive joint makes perfect sense, since the grease only replaces ex
isting insulating air gaps. Sometimes people use silver paste, but not beca
use it's electrically conductive--silver is a better heat conductor.=0A=0AW
hy any notion of zinc being "sacrificial" comes up is beyond me. You certai
nly wouldn't want to use it if it was. =0A=0AThe only reason not to use it
is that it is messy. Otherwise it would be everywhere.=0A=0A--------=0AEric
M. Jones=0Awww.PerihelionDesign.com=0A113 Brentwood Drive=0ASouthbridge, M
A 01550=0A(508) 764-2072=0Aemjones(at)charter.net=0A=0A=0A=0A=0ARead this t
opic online here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=373289
==
Message 10
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|
Subject: | Re: Anti-corrosive paste |
Dave,=0A=0AAs Mike says below, thanks for an extremely helpful reply on the
subject of pastes. -I'm gonna look for a tube of No-Ox-Id A Special to s
ee what it is like. -I'm going to compare it to the Permatex stuff one ca
n get at AutoZone to see which one I like better, as both are probably very
good for this application.=0A=0AThanks, everyone.=0AHenador Titzoff=0A=0A
=0A________________________________=0A From: Mike Wynn <wynaire@citlink.net
>=0ATo: aeroelectric-list@matronics.com =0ASent: Friday, May 18, 2012 2:02
PM=0ASubject: Re: AeroElectric-List: Re: Anti-corrosive paste=0A =0A--> Aer
oElectric-List message posted by: "Mike Wynn" <wynaire@citlink.net>=0A=0ATh
anks for an extremely helpful reply on the subject of pastes.=0AIt's time t
o add another goody to the tool box!=0AM. Wynn/A&P, LNC2 bld'r.=0A*********
=0A----- Original Message ----- From: "D L Josephson" <dlj04@josephson.com>
=0ATo: <aeroelectric-list@matronics.com>=0ASent: Friday, May 18, 2012 11:45
AM=0ASubject: AeroElectric-List: Re: Anti-corrosive paste=0A=0A=0A> --> Ae
roElectric-List message posted by: D L Josephson <dlj04@josephson.com>=0A>
=0A> On 5/17/12 11:57 PM, AeroElectric-List Digest Server wrote:=0A>> Hi Pe
ople,=0A=0AI would like to know what opinions you have on anti-corrosi
ve zinc paste to make our connections more reliable. -Below is a link to an
article on how ACZP helps make better connections by=0A> Bob- has explai
ned thoroughly about what's happening here. Let's go a few steps further. T
he idea is to make the metal-to-metal contact area of the conductors as lar
ge as possible by forming them into each other, and to exclude any contamin
ants that might get between the metals. Any nonconductive contaminant reduc
es the size of the contact area, which increases the resistance. Most troub
lesome are oxides and salts of the metals, which occur when air, water and
other chemicals eventually convert the metal to something else, producing a
barrier between the two parts. Zinc chromate paste excludes water to some
extent but its main function is to combine chemically with *aluminum* to pr
oduce a thin chemical film that is conductive, and to prevent the formation
of aluminum oxides which are not. I don't know whether any such reaction o
ccurs with copper, I haven't seen "ACZP" used for this purpose.=0A> =0A> Th
e idea of using a grease like silicone (DC4) is based entirely on excluding
air and water. Silicone grease is used on microwave and RF connections bec
ause it doesn't badly compromise the dielectric constant of insulators it g
ets on. But for DC, any ordinary grease will do; it also lubricates the par
ts as they are being crushed by the wrench or crimper, so they can conform
to each other's surfaces more readily. The very best grease for this purpos
e has been used for nearly 100 years for all kinds of high current applicat
ions by the telephone company, but it seems to be a secret in the light avi
ation industry. I first learned of it at a helicopter battery shop where th
ey made their own version, with a little more solvent added so it could be
painted on. It's cheap and readily available. It's a combination of petrole
um grease, some waxes to make it stiff and some amines to make it penetrate
into joints and spread throughout the voids in the contact over
time. It is closely related to "cosmoline" and is called No-Ox-Id "A Speci
al" made since the early 1910s by Sanchem in Chicago. A big tube of it sell
s on eBay for about $10 but you can buy cases of 24 at less than $5 apiece.
You can see the various other versions of No-Ox-Id on their site. A-Specia
l is thinned out a little so it can be squeezed out of a tube (if the tube
is a little warm.) You only need a very thin film but you can coat all the
metal parts with this, clamp them together and you're done.=0A> =0A> I have
taken apart telephone company installations more than 50 years old that ha
d this stuff in all their joints and there has never been any corrosion. Ma
ny fleet operators use it on battery posts and terminals to keep the lead f
rom corroding, you can even massage it into the joint between the post and
the battery case to slow down the battery acid vapors from getting to the p
ost that way. I started using it on aircraft and automotive things about 30
years ago and it just works.=0A> =0A> --=0A> David Josephson=0A> =0A> =0A>
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