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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