I have copper clad ground rods near the guy anchors and the copper is going
to want to strip the galvanising away as well..
73 Mark N1UK
----- Original Message -----
From: "K0DAN" <k0dan@comcast.net>
To: <towertalk@contesting.com>; "Hans Hammarquist" <hanslg@aol.com>
Sent: Thursday, 20 June, 2013 1:43 PM
Subject: Re: [TowerTalk] Fwd: Screw Anchor Experience
Hans...
In my experience this is not true. I have some photos of my failed
galvanized screw anchor which I can send you. The failure was a good 3+
feet below the ground surface, however I expect the metal rod was probably
compromised along its entire length.
The property I am on was once a working farm. I occasionally find gears
and other metal parts from farm implements I believe to date from the
1920's-1930's. This iron or steel parts are very solid and heavily rusted,
and the rust protects it from deeper corrosion (think: ocean
liner)...galvanized anchors, on the other hand, are not the same compound.
(Metallurgists please chime in). I suspect that the steel underneath the
galvanizing may be a very soft/cheap material (keep the costs down no
matter what), and once the galvanizing is compromised it does not take
long (15 years in my case) for the actual metal to be totally compromised.
What you describe for poles, fence posts, etc., is true, but I suspect we
are comparing apples and oranges. And again, we should not assume that all
soils are created the same. What I have here in west central Missouri is
probably much different than soils and ground water in other parts of the
country.
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