[TowerTalk] Experience with Sacrificial Zinc?

[Gary]

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 at contesting.com> On Behalf Of Máximo EA1DDO_HK1H
Sent: Monday, August 9, 2021 1:17 AM
To: Richard Smith <n6kt1 at sbcglobal.net>; 'towertalk at contesting.com' <towertalk at 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 at contesting.com> en nombre de Richard Smith <n6kt1 at sbcglobal.net>
Enviado: lunes, 9 de agosto de 2021 2:51
Para: 'towertalk at contesting.com' <towertalk at 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 at 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 at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk