Quote:
Originally Posted by Gatto Nero
Could it be that lower part of the the chain is resting on the bottom, and therefore constantly being rubbed against it as the boat moves? Wouldn't this, in addition to wearing the chain on it's own, also rub off each new layer of rust making way for a new layer of rust to corrode it further?
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That is a possibility in some cases, but in mine I don't think so. My mooring was configured with a float (actually a large boat fender) that was attached to the chain about 8' from the bottom to prevent the chain from abrading on the rocks. So for the first 8' from the granite mooring block, the chain went straight up.
I have a neighbor who for many years had a sailboat on a mooring that used a similar underwater float arrangement, and he observed the same corrosive effect on his chain ... after a few years the chain got progressively thinner the further down it went.