I did look into that for protecting my guy anchors. It would have been
cost-effective, but a lot of work to bury the wires. I went with
magnesium anodes, which will last longer than I do.
73,
Scott K9MA
----------
Scott Ellington. K9MA
--- via iPhone
On Aug 9, 2021, at 8:00 AM, Gary <gary_mayfield@hotmail.com> wrote:
Neat Topic -- I wonder if anyone has looked at active cathodic
protection, like used in the pipeline business?
73,
Joe kk0sd
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Máximo
EA1DDO_HK1H
Sent: Monday, August 9, 2021 1:17 AM
To: Richard Smith <n6kt1@sbcglobal.net>; 'towertalk@contesting.com'
<towertalk@contesting.com>
Subject: Re: [TowerTalk] Experience with Sacrificial Zinc?
There are different quality grades on hot dipped galvanizing. Those
quality grades are basically the size of the zinc layer.
For hard enviroment areas, galvanizing is thicker.
For extra protection, a special paint coat is needed, on the top of
the hot dip galvanizing.
It is two or three layers of two-componenets paint, called aliphatic
enamel.
So, if you hot dip galvanize a tower, with thick zinc layer,
industrial grade, then you apply two or three layer of aliphatic
enamel paint, you will get top professional protection, lasting many
years.
73, Maximo EA1DDO
________________________________
De: TowerTalk <towertalk-bounces@contesting.com> en nombre de Richard
Smith <n6kt1@sbcglobal.net>
Enviado: lunes, 9 de agosto de 2021 2:51
Para: 'towertalk@contesting.com' <towertalk@contesting.com>
Asunto: Re: [TowerTalk] Experience with Sacrificial Zinc?
Hi Grant,
Thanks for your response. At our station in PJ4, the Hot Dipped
Galvanizing is holding up well, but some parts are Electro-Galvanized
and are already corroding. Part of the problem is erosion from trade
winds, which seems to wear down the Electro-Galvanizing, which then
exposes the base metal to a corrosive environment. Specifically, the
Orion rotor drive plates and mast clamps seem susceptible to the
erosion and the subsequent corrosion.
I was wondering if attaching a piece of zinc metal directly to those
specific parts would slow down the corrosion. The team is looking at
changes to help this situation in the future, but I'm also trying to
find a quicker solution for the parts that are already installed.
The black tar coating followed by PVC tape sounds like a very good
solution for buried parts.
73, Rich, N6KT
On Sunday, August 8, 2021, 05:11:51 PM PDT, Grant Saviers
<grants2@pacbell.net> wrote:
The MIL-HDBK-419A talks a little about this topic. Adding Zn
electrodes to a galvanized tower creates a parallel circuit, not clear
which will go first IMO. Impressed voltage systems are probably a
better option.
google it.
I black tar coated my galvanized guy anchor rods and then wrapped them
with 20mil 2" wide PVC tape for abrasion resistance to 2 feet above
grade, same as done for black iron gas pipes that are buried. Should
last longer than me.
Grant KZ1W
On 8/8/2021 16:30, Richard Smith wrote:
Hi Tower Talkers,
It seems that sacrificial zinc is commonly used in boating to stop
corrosion. The sacrificial zinc corrodes and "saves" the metal to
which it is attached.
Does anyone in TowerTalk land have experience with using sacrificial
zinc with towers and/or antennas?
73, Rich, N6KT
_______________________________________________
_______________________________________________
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
_______________________________________________
_______________________________________________
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
_______________________________________________
_______________________________________________
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
|