If you've got galvanic corrosion, you guys are correct. That takes a
dissimilar metal pair, or 3 if you add a sacrificial anode, and an
electrolyte. Read that last part again. Without your electrolyte, you don't
have galvanic corrosion and an anode doesn't prevent "other types of
corrosion". Coatings are often used to prevent galvanic corrosion... by
keeping the electrolyte off and out of the circuit.
Anodes don't reduce all types of corrosion!
regards,
Dave N3AC
On Sun, Aug 8, 2021 at 10:12 PM <john@kk9a.com> wrote:
> That is what galvanizing does.
>
> The zinc acts as a sacrificial metal to protect the underlying iron/steel
> and thus acts as a sacrificial anode. In the event the underlying metal
> becomes exposed, protection can continue as long as there is zinc close
> enough to be electrically coupled. After all of the zinc in the immediate
> area is consumed, localized corrosion of the base metal can occur.
>
> John KK9A
>
>
> Richard Smith n6kt 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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