I found this interesting oxide inhibiting post by WA4VZQ:
http://www.qth.net/pipermail/antennas/2002-August/002328.html
John KK9A
Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.
On Fri, Feb 16, 2018 at 2:46 PM, Wayne Kline <w3ea@hotmail.com> wrote:
> Some Say Tomatoes Some Say tomottoes ...
> As with most on the list antennas are in our Blood.
> my fist beam a Mosley TA33Jr. came with a plastic tube of Gray Penetrox
> My Stint as an industrial electrician We use Dow Noalox buy the gallons
> on ALL connection Bugs , Lugs and switch gear.
> My first installation of the then Bencher Sky Hawks ( a three high stack )
> during assembly then came with this GOOP called Monkey stuff ??? if my
> memory still intact. Over the years of installing and assembling
> antennas it became painfully obvious when any of the products were not
> used in assembly. !!!
> I just last year got my hands on an original design Skyhawk and the
> elements came apart A -OK but the GOOP !!!! a red scrubby pad and lots
> of Lacquer thinner to clean the joint area.
> I assembled it with the Jet Lube SS-30 Amazon .com
>
> Again my area is not In a Salt Spray environment just ice, snow, wind
> and rain !!!
>
> YMMV
>
> Wayne W3EA
> ------------------------------
> *From:* TowerTalk <towertalk-bounces@contesting.com> on behalf of
> john@kk9a.com <john@kk9a.com>
> *Sent:* Friday, February 16, 2018 1:23 PM
> *To:* towertalk@contesting.com
> *Subject:* Re: [TowerTalk] Al-to-Al
>
> Penetrox has zinc particles and the SS-30 that K3LR uses has copper. Zinc
> is much closer on the galvanic chart to aluminum than copper which
> concerns me.
>
> John KK9A
>
> To: towertalk@contesting.com
> Subject:Re: [TowerTalk] Al-to-Al
> From: Patrick Greenlee <patrick_g@windstream.net>
> Date: Fri, 16 Feb 2018 09:42:52 -0600
>
> Conductors (at least metals) are rated on an electromotive scale. The
> farther apart they are on the scale the greater the voltage generated when
> an electrolyte is present. Stick a piece of aluminum into a lemon (citric
> acid solution for electrolyte) and also stick in a piece of copper and
> touch the two metals with your multimeter probes and note the voltage.
> Switch over to current measurement and see the short circuit current the
> little battery will produce.
>
> When dissimilar metals (different ratings on the electromotive scale)
> touch in the presence of an electrolyte (acid rain, salty ocean breeze,
> etc current flows and the less noble metal is eaten away by electrolysis
> (AKA electrolytic corrosion.)
>
> Zinc particles in an oil or grease base are protected from contact with an
> electrolyte. When a joint has Penetrox or other equivalent zinc particle
> bearing paste in it and is tightened the zinc particles are in contact
> with the two substrate materials to be joined, promoting good conductance
> and are protected from galvanic action by the oil/grease. By itself zinc
> is not magic and will corrode easily. You wouldn't want to use zinc
> washers in place of the zinc particle loaded paste.
>
> Replaceable pieces of zinc are used on prop shafts and propellors to
> protect the shaft and prop from damage by electrolysis. The zinc is
> considered a "sacrificial element" as it is eaten away by electrolysis
> while protecting the prop and shaft. Many of the 6 gal water heaters found
> on RVs have replaceable sacrificial zinc rods in them. In that service
> corrosion of the replaceable zinc is intentional to protect other
> components. In joining aluminum antenna components you don't want
> corrosion and the zinc in the paste is not intended to be sacrificed to
> protect the aluminum.
>
> Anyone want to design sacrificial zincs to put on antennas?
>
> Patrick NJ5G
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|