Hi Robin- I wouldn't use brass for a bushing; brass breaks down quite fast under salt water. Brass is simply copper and zinc, and the zinc goeas away pretty fast, which leaves a copper sponge. Brass was used for deck hardware on the old boats because it was cheap, but never un derwater. Bronze would last a long time if you stored the boat on a trailer but if you keep it in salt water I'd use micarta or something like that. Bronze would be fine for the pin, but inspect it every few years. jerry ----- Original Message ----- From: "robbin roddewig" <robbin.roddewig@verizon.net> To: <montgomery_boats@mailman.xmission.com> Sent: Monday, December 06, 2010 4:12 AM Subject: M_Boats: dissimilar metals corner
First I appreciate all the great responses I got on the trailer rebuild. Lots of really good ideas which will make it very easy (in theory, until I try to remove rusted parts) for me to replace the whole drum brakes system on the old trailer without spending a wad of cash. Second, sorry for so many posts but I have another question that I am pretty sure the collective knowledge of the group could help with. I am about to epoxy a couple of brass bushings into my centerboard to replace the fiberglass bushing that I ground out of the pivot hole. When it occurred to me that I should consider whether I would have any issues with dissimilar metals since the centerboard sits in water (dielectric). I should know more about this but my engineering has kept me clear of battery chemistry and such and the only thing I found online is that I probably should not put a (Silicon) Bronze pin through my Brass bushings. So my question is given I have the freedom to put in what ever pin I want (from Duckworks) and can get some more bushings for $10-15 from McMaster Carr easy what would be a good combo of materials? I am assuming I can isolate the steel of the board and the bushings with the barrier coat and epoxy that the bushings will be put in with, so the issue would be the bushings and the pin.
Thanks Robbin
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