Can I prevent s/s crevice corrosion with epoxy ?

[eranb2]

Hi

All the talking about crevice corrosion , can I prevent the corrosion with epoxy ?
it will prevent sea water and moisture from getting in to the
U bolt inside the deck .

is that a good idea?

If s/s must get oxygen , then epoxy will help or destroy?

 

[boatmike]

If it is not an underwater fitting you should not have a problem anyway but if you want to seal a u bolt in the deck, urethane (like Sikaflex) is even more impervious to water than epoxy.

 

[demonboy]

Plus epoxy doesn't flex, so if it's a deck fitting that takes strain you'll crack the epoxy. Use Sikaflex bedding compound (291, not 290, which is the caulking stuff). Give the fitting a good clean and sand and if you have a round file, poke it down the holes to clean them out too. Also, after applying the Sikaflex, do the nuts up from underneath but don't tighten. Allow the compound to dry and then tighten the nuts up the next day. This will squish the dried Sikaflex, thus creating a seal.

 

[VicS]

I agree with boatmike a good seal wth a sealant is the way to do it. Sikaflex 291 will will make a good job that will last for a long time but it will be difficult to remove the fitting again. Silicone may not last for as long but it will be easier to remove the fitting if necessary.

Epoxy will glue the fitting in place so that it will be impossible to remove it again it is also hard and brittle so it may crack and still let water in.

The aim is to exclude (salt) water provided you have done that you will not get crevice corrosion

 

[oldharry]

I agree with the others. Crevice corrosion occurs in water and the absence of an oxidised coating on the steel surface. Epoxy on a fitting carrying a variable load may well crack and allow water in and actually make the problem worse. As suggested, Sikaflex will move with the fitting without ever allowing water in.