[TowerTalk] Fwd: Experience with Sacrificial Zinc?

[K9MA]

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 at 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 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
>> _______________________________________________
>>
>>
>>
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