Electrolysis? Keel box srews

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Tagged: Corrosion screws brass

This topic has 1 reply, 2 voices, and was last updated 1 year ago by Chris Green.

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23/07/2023 at 11:52 #26707

A148 Johara
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Could someone tell me what,s happening and how to fix it?
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- 23/07/2023 at 12:48 #26708
  
  Chris Green
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  Oxidisation of the original bronze screws around the keel boxes seems to be the issue in the photo. Over time the whole screw can degrade and allow moisture ingress. If it is just the heads of screws, they can be cleaned and a coat of varnish, epoxy or paint – polyurethane or two-pack etc will prevent further deterioration. It would be prudent to check the screws by extracting some of them. If replacing oxidised screws, it would also be prudent to seal the holes with epoxy as the plywood may have degraded around the oxidised screws. This is a maintenance issue to keep an eye on and affects the hull fixings as well.
  
  I hope this helps
  
  Chris
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