welding zinc divers delight

Discussion in 'Metal Boat Building' started by glasssurfer, Dec 17, 2009.

  1. glasssurfer
    Joined: Dec 2009
    Posts: 39
    Likes: 2, Points: 0, Legacy Rep: 25
    Location: qudara island

    glasssurfer Junior Member

    looking to weld on some studs onto my hull so i can mount my zinc on a "divers delight" style but im going to have to beach my hull grind and clean the section to weld the post onto but then i ned to put a product on to protect the bare steel, correct?

    should i use coal tar epoxy or ????
    g
     
  2. marshmat
    Joined: Apr 2005
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    Location: Ontario

    marshmat Senior Member

    For zincs to work, they have to be in contact with the bare metal. You should be able to use the same primer/antifouling as on the rest of the hull, except for where the anode will actually mount. That part must be left bare.
     
  3. glasssurfer
    Joined: Dec 2009
    Posts: 39
    Likes: 2, Points: 0, Legacy Rep: 25
    Location: qudara island

    glasssurfer Junior Member

    thanks, im guessing the hull is painted with coal tar epoxy already so on the ground spot after the zinc is welded more coal tar epoxy should be painted on to cover up, will it bond properly with the already painted rest of the hull?
     

  4. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Here is how a ships zinc is mounted and this will last more than 5 years and is generally reusable for the life of the ship. If not, it is easy to knock off, grind flush and place another.

    Use a capacitive discharge (CP) SS (308 perfrered) stud of the proper length. Shoot straight through the existing paint, and touch up with matching paint up over the stud weld flange but leave the stud threads bare. Mount the zinc, fill the stud hole void with zinc paste, cover the paste with a close fitting plain steel fender washer and a SS nyloc nut.
     
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