I think I’m suffering from stray current corrosion. I’m on a ball at the yacht
club and as said earlier, the only time I’m connected to AC is when Persuasion
is on the hard. I’ve started eliminating different devices looking for the
leak. A very slow process.
C&C 37 K/CB
> On Aug 10, 2018, at 3:16 PM, Della Barba, Joe via CnC-List
> <firstname.lastname@example.org> wrote:
> I am a bit late to this, but FYI:
> Galvanic corrosion is caused by two different types of metal in water that
> are electrically connected. The “less noble” metal is the one that corrodes,
> which is why we use zincs (or magnesium or aluminum).
> There has to be a path between the metals for this to happen. This can get
> much much worse when on shorepower because all the boats in the marina end up
> wired together via the green ground wire connection. If no one buys new zincs
> but you, guess who supplies the entire marina with anode material? YOU DO!
> Galvanic isolators are 100% needed for any boat on shore power for this
> The other form of corrosion is stray current corrosion. This does not need
> different metals to work, just electricity flowing through the water. The
> current moves metal from one place to the other, this is how electroplating
> works. This can be very complicated to track down and can do a vast amount of
> damage very quickly. There are a lot of different ways this can happen, but
> imagine a boat with the keel connected to the ground bus, a negative ground
> engine, and a SSB ground plate with DC connection through to the radio. We
> now have 3 different underwater metals connected to the negative side of the
> DC system. If the onboard ground bus and wiring are not perfect, some current
> will flow through the water too.
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Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray