Corrosion pitting on floats

[Wayne G. O'Shea]

This is my fifth season with the floats on.... and the first time I've seen
this. This year I left my airplane in the water for about 5 weeks tied to
one of my dock ends. I got the same little beige growths on the side skins
below the water line, that you usually see on the sacrifical anodes on your
outboards....and I scrubbed them off and then kept my airplane on the
airlift for the remainder of the summer. With the airplane clean and dry in
the hanger I can put my knife point in these dozens of little pit holes and
I bet they're half the skin thickness deep. Has anybody else had this happen
to you???

My first thought is where I had my airplane tied to the dock end in about 3
feet of water there is a rusty casing'd, 2400 volt, submersible cable
running under the airplane and wonder if the leakage off this hydro line
caused the plating effect.

Wayne





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[Ralph Baker]

Wayne,
See if you can contact one of your Hydro transmission / distribution engineers and have a conversation with him on cathodic protection. That is the electrical method used by utilities for preventing corrosion long term for buried conduits. There may be a simple system you can build for yourself. I would approach it in a friendly (non business) manner so his legal ears don't perk up. While marinas do have a fit with certain shore power / battery charger situations I don't think that is what you are facing.

Twelve volts will not damage people. It is not the voltage in any case, it is the amperage. Otherwise we would all die from static discharges in the winter. Five milliamps is the threshhold for danger and that through the heart where it disturbs the electrical activity in the heart muscle that runs the pump.
Ralph Baker



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