galvanic corrosion problem

[Disielcustoms]

Hi I just unstepped my mast to replace the rigging. I found some galvanic corrosion on the spreader tips and around some fasteners in the mast and boom. I am looking for best practice to treat this area before stepping the mast again. I have included some pictures.

Thanks

[Amnesia II]

Use barium chromate.

[Simi 60]

Originally Posted by Amnesia II

Use barium chromate.

More commonly known as duralac.

[NYSail]

Originally Posted by Simi 60

More commonly known as duralac.

Grease.....

[wingless]

Don’t have dissimilar metals in contact.

[leftbrainstuff]

Originally Posted by NYSail

Grease.....

Common problem that requires careful selection of dissimilar metals to minimize corrosion. Get yourself familiar with a marine dissimilar metals chart.

Then ensure through correct selection and where possible isolation you minimize or eliminate crevice, galvanic or pitting corrosion. Ideally you should be able to visually inspect suspect contact areas.

Use plastic, low viscosity or products or seperarion.

Lanacote and turf gel work well as do many of the engineering plastics.

[Disielcustoms]

Thanks for the replies. I am a bit familiar with why the corrosion is happening and there is not much I can do with material selection. In the spreader tips its because of the Stainless Steel shrouds and in the other pics its the SS rivets. I have tub of Tef45 which Ill be using liberal. I guess I should have a better job at asking the question. I would like advice on repairing the already corroded area. Should I use some epoxy paste to fill the holes and pits cause by the corrosion? I bought an aluminum filled epoxy that I am thinking of using and then coating the spreader tip with a thin coat of epoxy to help protect it. but not sure if this is the best course of action. Also thinking of doing the same thing around the SS rivets ( drilling out the old and replacing with new of-course)

[Amnesia II]

Originally Posted by Disielcustoms

Thanks for the replies. I am a bit familiar with why the corrosion is happening and there is not much I can do with material selection. In the spreader tips its because of the Stainless Steel shrouds and in the other pics its the SS rivets. I have tub of Tef45 which Ill be using liberal. I guess I should have a better job at asking the question. I would like advice on repairing the already corroded area. Should I use some epoxy paste to fill the holes and pits cause by the corrosion? I bought an aluminum filled epoxy that I am thinking of using and then coating the spreader tip with a thin coat of epoxy to help protect it. but not sure if this is the best course of action. Also thinking of doing the same thing around the SS rivets ( drilling out the old and replacing with new of-course)

Pitting appears to be very minimal, I’d just coat liberally with Duralac and re assemble. Your idea to drill out rivets and replace is a good idea, bed with Duralac.