Caution is advised
Given what we know, and what we don't know, most sailors err heavily on the side of caution with these things. I'm just now replacing my chainplates for this very reason. I pulled them out and expected to see crevice corrosion after them being in for 20 years, and was surprised to see that they looked like new even between the deck sections.
I pulled them out anyway, and ordered new, thicker chainplates from Garhauer to replace them. I didn't need a metal test or microscope to know that 20 year old chainplates should not be trusted for another 10-20 years. NO matter what they look like.
When in doubt, replace stuff!
Bainbridge Island, WA
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