[TowerTalk] Experience with Sacrificial Zinc?

[Máximo EA1DDO_HK1H]

I think so.

Brite-Zinc seems to me like an anti-rust paint, for protection. Usually on steel.
Urethane aliphatic enamel is a synthetic cover to give an extra protection layer on the top of the zinc.

Professional towers are like that, hot dip galvanizing, then several layers of that urethane paint.
That procedure gives you years and years of protection.

73, Maximo

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Richard Smith
Sent: lunes, 9 de agosto de 2021 20:54
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Experience with Sacrificial Zinc?

 Thanks to John and Maximo (and others) for your responses. Would I be correct to think that the choice of paints depends on how much corrosion is already present?
The BriteZinc might be for galvanized metal that already has some corrosion, and the urethane aliphatic enamel is for galvanized metal that has little or no corrosion already, and is very good to prevent corrosion from starting?
Am I understanding the applications correctly?
73, Rich, N6KT
    On Monday, August 9, 2021, 10:18:18 AM PDT, Máximo EA1DDO_HK1H <ea1ddo at hotmail.com> wrote:  
 
 I don´t think that type of paint is the correct for this task.
I would suggest to ask for "urethane aliphatic enamel", in two-components (base and hardener, to mix before to use it). You can select the better color to suits your needs, but a common color for country field areas is dark green.
Apply one layer, next day or so a second layer. Third optional.
You can try that on a small section, or in a secondary tower.
You will be amazed how good that coating is.

73, Maximo EA1DDO

-----Original Message-----
From: john at kk9a.com [mailto:john at kk9a.com] 
Sent: lunes, 9 de agosto de 2021 14:06
To: 'Máximo EA1DDO_HK1H'; towertalk at contesting.com
Subject: RE: [TowerTalk] Experience with Sacrificial Zinc?

Perhaps there is better paint, I used BriteZinc  which is a zinc enriched
paint.  It was a lot of work and still corrosion was winning the battle. 

I am not sure what paint PJ4G uses but it is very very thick and it seems to
be holding up.

John KK9A  

From: Máximo EA1DDO_HK1H [mailto:ea1ddo at hotmail.com] 
Sent: Monday, August 9, 2021 8:35 AM
To: john at kk9a.com; towertalk at contesting.com
Subject: RE: [TowerTalk] Experience with Sacrificial Zinc?

John, 
What type of paint you used?
Have you tried urethane aliphatic enamel?

73, Maximo EA1DDO

________________________________________
De: TowerTalk <towertalk-bounces at contesting.com> en nombre de john at kk9a.com
<john at kk9a.com>
Enviado: lunes, 9 de agosto de 2021 11:52
Para: towertalk at contesting.com <towertalk at contesting.com>
Asunto: Re: [TowerTalk] Experience with Sacrificial Zinc? 
 
Correct on the paint, Máximo. I painted my P4 Rohn 55G tower often. In
theory the hot dipped galvanizing protects the steel and the paint protects
the galvanizing from the corrosive environment. The constant wind and salt
spray wore away my paint quickly and it required frequent maintenance. 

John KK9A
   

Máximo EA1DDO HK1H wrote:

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

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