cross galvanic corrosion?

Discussion in 'Boat Design' started by Cmw505, Aug 20, 2019.

  1. Cmw505
    Joined: Jul 2019
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    Location: USA

    Cmw505 Junior Member

    So just a quick question..if two different hulls in the same marine close to each other let's say one made of alumnium and the other steel what exactly stops these hulls from interacting with each other so close by? thanks
     
  2. Heimfried
    Joined: Apr 2015
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    Location: Berlin, Germany

    Heimfried Senior Member

    To build up a galvanic current circuit there must be a electroconductive link between the hulls (a second link besides the water). This can happen indirectly if both boats are connected to onshore grid ground. To prevent this the market offers galvanic separators.
     
  3. Cmw505
    Joined: Jul 2019
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    Cmw505 Junior Member

    thanks heimfried
     
  4. JSL
    Joined: Nov 2012
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    Location: Delta BC

    JSL Senior Member

    I thinks these are same as isolation transformers
     
  5. MikeJohns
    Joined: Aug 2004
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    Location: Australia

    MikeJohns Senior Member

    An isolating transformer without the earth connected thru would do it but it's a heavy expensive option .
    Galvanic isolators are installed in the Earth line only and interrupt continuous dc currents while still passing AC fault currents. They are a much more sensible solution.
     

  6. Cmw505
    Joined: Jul 2019
    Posts: 32
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    Location: USA

    Cmw505 Junior Member

    i was just curious cause as i'm studying boat design and hulls,and materials etc. i started to learn about sacrificial anodes and it got me thinking with boats so close together in the marina how on earth do they not interact assuming that there moored to the dock?. but heimfried just explained that.
     
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