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While working on the bilge pump through-hull (on the right), I noticed some serious electrolysis on the U-bolt for the transom tie-down. "Electrolysis." What a great name for a boat. Sounds like a Greek God.
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This is the same stainless u-bolt fitting used in the bow for the trailer winch. At first, I thought maybe it had a mild steel nut or washer on the SS u-bolt. Nope. This must be caused by condensation on the metal. Cold is transferred into a moist interior and it gets wet. Still odd that there is rust. It could be that one is 304 stainless and the other is 316.
Here is what was under the skimpy SS backing plate. Just compacted aluminum dust. Turns out that the transom in this area is solid fiberglass, so the electrolysis was simply from using aluminum and SS together in a marine environment. The other side wasn't as bad, but it also was fixed.
The aluminum backing plate was almost gone. I feared it was because the balsa core was wet enough to start a battery between the stainless steel and the aluminum. I reached up and pulled the backing plate off. Obviously, it wasn't doing anything other than sprinkling powder into the cockpit.
While working on the bilge pump through-hull (on the right), I noticed some serious electrolysis on the U-bolt for the transom tie-down. "Electrolysis." What a great name for a boat. Sounds like a Greek God.
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While working on the bilge pump through-hull (on the right), I noticed some serious electrolysis on the U-bolt for the transom tie-down. "Electrolysis." What a great name for a boat. Sounds like a Greek God.

While working on the bilge pump through-hull (on the right), I noticed some serious electrolysis on the U-bolt for the transom tie-down. "Electrolysis." What a great name for a boat. Sounds like a Greek God.
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Electrolysis
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While working on the bilge pump through-hull (on the right), I noticed some serious electrolysis on the U-bolt for the transom tie-down. "Electrolysis." What a great name for a boat. Sounds like a Greek God.
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Marco Flamingo
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