Author Topic: Rudder Corrosion  (Read 197 times)

Offline Don from Peconic Bay

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Rudder Corrosion
« on: December 28, 2017, 10:43:00 AM »
I'm about to start my foiled rudder project and have found so many great ideas posted here by those talented folks who have shared their rudder projects.  Before I start I am curious to know what others did to prepare the original aluminum rudder plate before covering it with foam. Mine is quite corroded. Pressure washing has removed a lot of the corrosion but can't get it all. Is there a product for aluminum that will convert the remaining corrosion similar to rust stop for iron.  Or should I just coat with a primer before applying foam.  Thanks for any tips you can offer.
Don
Believe me... there is nothing ... half so much worth doing as simply messing about in boats.

Offline Floridagent

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Re: Rudder Corrosion
« Reply #1 on: December 28, 2017, 04:56:47 PM »
Aluminum oxide is purported to protect aluminum.  So, I would wonder if it needs to be removed.  As I recall there are discussions on the forum as to what may be members’ best experiences painting aluminum. Obviously, the primer needs to work well with aluminum oxide as well as aluminum itself.  Good luck with your project!
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Offline Bob23

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Re: Rudder Corrosion
« Reply #2 on: December 28, 2017, 08:15:25 PM »
I sanded, sanded and sanded some more and used a zinc chromate primer. Worked well and has held up. The exposed part of the blade I then painted with Rustoleum bronze spray paint and it too has held up well. I sail in a salt water area.

Offline Don from Peconic Bay

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Re: Rudder Corrosion
« Reply #3 on: December 28, 2017, 11:24:25 PM »
Thanks Bob, sounds like a plan.  I printed up my templates today and as soon as the garage warms up a little I'll get to work .
Don
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Offline Bob23

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Re: Rudder Corrosion
« Reply #4 on: December 29, 2017, 04:20:42 AM »
Welcome. I took a different route with my rudder. It's a wood sheathed foil build around the original aluminum blade. The procedure is buried deep in the archives of my thread here under the 23 section "The continuing adventures of Koinonia" but the photos have probably disappeared due to that dreaded Photobucket policy change. I can email you a few if you'd like. They may be helpful even if you're not going to build yours as I did. It's holding up well considering it's now 7 or 8 years old. It really enhanced the boat's performance and looks great with a clear finish over the wood which resembles Mahogany.

Offline Don from Peconic Bay

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Re: Rudder Corrosion
« Reply #5 on: December 29, 2017, 01:33:41 PM »
Bob,your rudder refit was way beyond anything I could handle and it looked great.  Glad to hear that it has held up well and the performance improvement.  Not sure if I'll go with the hardwood leading edge or just foam the whole thing and give the leading edge an extra layer or two of glass. 
Believe me... there is nothing ... half so much worth doing as simply messing about in boats.

Offline Bob23

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Re: Rudder Corrosion
« Reply #6 on: December 29, 2017, 04:09:38 PM »
Don, sorry I'd forgotten that we'd talked about this already. The senior moments are starting to last weeks!! Happy rudder new year to you!!