Hot dip zinc gaalvanized steel boat

Discussion in 'Metal Boat Building' started by tojeres, Dec 14, 2019.

  1. tojeres
    Joined: Dec 2007
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    tojeres New Member


    Does anybody have experience with hot dip galvanized steel whole boat ?

  2. jehardiman
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    jehardiman Senior Member

    That would be a huge and very expensive dip tank (remembering that the tank must be heated to the melting temperature of zinc). I'm sure you could probably find someone with a tank that could possibly fit a 2-2.5m hull (check the guys making cattle watering troughs), but nothing larger. Also remember that HDG results in a significant lowering of the strength of the steel. Plasma/thermal sprayed zinc has been around for more than 30 years and is the way it is normally done. Note that making repairs to thermal sprayed steel as its own issues.
  3. tojeres
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    tojeres New Member

    Thank you for the opinion. Yes, HDG has to be done professionally in a factory. Regarding lower strength, I think it is negligible. I assume boat would be more sensitive to corrosion on scratches outside of a hull and less sensitive to corrosion inside a hull.
    I was not aware of thermal sprayed zinc. From other threads I see it is sucessfully used. I assume it is similar to HDG and therfore HDG seems good option.
  4. gonzo
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    gonzo Senior Member

    You could use Thermal Spray. It uses a flame to melt the metal to be deposited and heats the base metal.

  5. Wynand N
    Joined: Oct 2004
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    Wynand N Retired Steelboatbuilder

    Actually, a steel hull usually rusts from the inside out...think condensation.
    If possible, a hot dip hull plates would distort badly. I used to get some large tanks dipped and plates warps from the heat and it is safe to say a boat hull would act the same way.
    HDG like "jehardiman" suggests is the best way to go and I used it on a few hulls with great success.
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