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ashontz
Joined: 27 Dec 2006
Posts: 723
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 Posted: Tue Nov 27, 2007 9:31 am Post subject: Galvanic chart |
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I just posted a subquestion in my last post about corrosion and fittings. For anyone interested here's the galvanic chart. Obviously for really intense corrosion to occur you need and electrolyte like salt water, but even so, humidity can be a problem.
http://www.corrosion-doctors.org/Definitions/galvanic-series.htm
Generally on aluminum boats they mount a sacrificial anode of zinc.
Anyway, as far as fittings for an aluminum fuel tank, it looks like a zinc plated fitting would be better than a brass fitting. At least if one corrodes over time it'll be the zinc fitting which you can replace.
I'm wondering if Aircraft Spruces insanely expensive fittings are just zinc fittings. Trying to think if I've seen regualr hose barbs and stuff at the hardware store that were zinc. They carry lots of brass for sure. I'f anything, a zinc fitting should be even cheaper.
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cscsail(at)gmavt.net
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| Posted: Tue Nov 27, 2007 2:09 pm Post subject: Galvanic chart |
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Andy,
I don't think you will have much galvanic corrosion unless you are on
floats and even then I don't believe it would be a big problem. But -- Zinc
anodes work well in salt water, but poorly in fresh water. In fresh water
you will want to use magnesium as your anode.
Gordon
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