[TowerTalk] screw anchors

[Pete Smith]

You need a chemist or a corrosion engineer, Pat.  I don't know the answer to that.  What I have done, for whatever it is worth, is to get rid of all copper-plated ground rods around my tower in favor of galvanized steel ones, to eliminate the galvanic differential.

73, Pete N4ZR

At 03:56 PM 1/16/2006, Pat Barthelow wrote:
>Pete, N4ZR Said:
>>It's probably worth pointing out that ANY anchor scheme that relies on 
>>galvanized steel hardware below ground is exposed to the same potential for 
>>galvanic action; some pretty serious tower people around here make it a 
>>practice to coat any galvanized hardware that will be below ground with 
>>asphalt roofing cement before installing it.
>>
>>73, Pete N4ZR
>
>Thanks for that info Pete.   I wonder if there is a problem with coating the 
>undergroud portion, if you do not have a PERFECT insulative seal with the 
>coating, if the very small, say, pinhole that remains exposed, causes a high 
>density of galvanic current, attacking the metal at a point location, that 
>will hasten the erosion at a single point, compared to a large area of steel 
>that might be attackeed more gradually.
>73, de Pat AA6EG  aa6eg at hotmail.com
>
>
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