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I have a Union Polaris 36.
Last time I took the chainplates bolts out (1998?), they looked fine, and the chainplates.
Stainless is terribly unforgiving if it gets de-oxygenated when seawater is around.
Those bolts and nuts you pictured are showing classic chloride attack. In the presence of oxygen, even oxygenated seawater, it simply does not happen.
But how the heck do we get oxygen into chainplate fasteners that are seawater wet?
One of my stern-plate bolts was eaten almost right through back in 1992. I will need to check those too, soon. Between tides will do it, I guess. This far north, 57 degN, we have big enough tides.
I will have a look at all of my chainplates in the spring.
Does bronze work better?
Do we need carbon fibre chainplates?
Right now, I am in freshwater, and have been for some time. Beautifully-clean Loch Ness freshwater too, if a bit "peaty". I notice that the bronzes adore it. Maybe I need to stay there?
Last edited by Rockter; 01-01-2012 at 08:45 AM.