I don't discuss my member
Join Date: Feb 2003
Location: Under a boat, in a marina, in the San Francisco Bay
Thanked 44 Times in 41 Posts
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Your shaft has suffered dezincification due to electrolytic or galvanic corrosion. The pinkish color indicates that the zinc component of your bronze shaft has been depleted (this why we use sacrificial anodes) and the shaft material is now seriously weakened and brittle. If it's bad enough that metal is actually flaking off the shaft, I would replace the shaft.
This kind of damage is unlikely to occur in a short period of time. While it's possible there is some electrical problem that is the root cause of this (most likely to be aboard your own boat, rather than a neighbor's or the shorepower system), it sounds like the boat has been unprotected by zincs for quite a while. You absolutely need to make sure your zincs are replaced periodically.
Last edited by Fstbttms; 08-02-2008 at 12:26 PM.