Corrosion

[Guest]

I have an iron centerboard on my Herreshoff America catboat. Is it recommended to apply copper antifoul paint to this, or will that cause a dissimilar metal corrosion problem, and speed the inevitable demise of the board? Also, is it recommended to attach a zinc to an iron board? Thanks for your input.

 

[Strathglass]

Normal treatment for a cast Iron Keel is to have it shotblasted and immediately (within an hour) epoxy coated before any treatment such as antifouling. This would insulate the iron from the copper.

Iain

 

[ccscott49]

Copper antifouling on steeel is fine, I would shotblast it, epoxy underccoat it, then antifoul it. A zinc anode is a very good idea and in fact neccessary, make sure it makes a good electrical connection, IE, clean the area of antifoul, to bare steel where the bolt/nut and washer attaches it to the centre plate. Then antifoul over the bolt/nut and washer, NOT the anode itself.