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Salt Water Corrosion of Swim Platform

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  • Salt Water Corrosion of Swim Platform

    My friend and customer bought his boat in Florida and then sailed it to Lake Superior. The salt water did a job to some of the aluminum components of the swim platform. I machined a couple of parts for the new swim platform, but I couldn’t help Ray with the main fabrication because it was too thick for my Dynasty 200 DX welder. The components of the swim platform were powder coated. Some areas are still in pristine shape but the salt water must have got through or around the powder coating and badly corroded other areas. The first picture shows the swim platform before it was cleaned up.
    1. Original swim platform mechanism
    Click image for larger version

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    The next picture shows the corrosion on the bearing journals of the main fabrication link of the swim platform.


    2. Heavy corrosion of the bearing journals
    Click image for larger version

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    Picture 3 shows a close up of two of the journals of the main fabrication.


    3. Close up of the journal corrosion.
    Click image for larger version

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    Picture 4 shows the new swim platform.
    Click image for larger version

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    Picture 5 is a close up view of the new journals of the new swim platform.

    5. New Journals
    Click image for larger version

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    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Lincoln LE 31 MP
    Lincoln 210 MP
    Clausing/Colchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport

  • #2
    The last picture shows the swim platform mounted on the boat.


    6. New swim platform mounted on boat
    Click image for larger version

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    Here is a link to another post from Tarry99 regarding corrosion and salt water.


    #6

    -Don
    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Lincoln LE 31 MP
    Lincoln 210 MP
    Clausing/Colchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport

    Comment


    • #3
      This picture shows the shaft in the corroded journal. You can also see the plastic bearings.

      Click image for larger version

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      Ray confirmed that he didn’t find any anodes on the old swim platform.

      -Don
      Miller Thunderbolt
      Smith Oxyacetylene Torch
      Miller Dynasty 200DX
      Lincoln SP-250 MIG Welder
      Lincoln LE 31 MP
      Lincoln 210 MP
      Clausing/Colchester 15" Lathe
      16" DuAll Saw
      15" Drill Press
      7" x 9" Swivel Head Horizontal Band Saw
      20 Ton Arbor Press
      Bridgeport

      Comment


      • #4
        I did a little research about anodes. It turns out that for optimal protection you need different materials for different water.

        • Zinc Alloy Anodes = Salt water only
        * Not recommended for use in fresh water
        * Alloy is manufactured to meet or exceed US Military Specification (MIL-A-18001K)
        • Aluminum Alloy Anodes = Salt or Brackish water
        * Not recommended for use in fresh water
        * Proven to last longer than zinc due to increased capacity
        * Alloy is manufactured to meet or exceed US Military Specification (MIL-A-24779(SH))
        • Magnesium Alloy Anodes = Fresh water only
        * Not recommended for use in salt or brackish water
        * The only alloy proven to protect your boat in fresh water
        Here is a link to my reference.

        https://www.defender.com/html/zincs_info.html

        -Don
        Miller Thunderbolt
        Smith Oxyacetylene Torch
        Miller Dynasty 200DX
        Lincoln SP-250 MIG Welder
        Lincoln LE 31 MP
        Lincoln 210 MP
        Clausing/Colchester 15" Lathe
        16" DuAll Saw
        15" Drill Press
        7" x 9" Swivel Head Horizontal Band Saw
        20 Ton Arbor Press
        Bridgeport

        Comment


        • #5
          Just brush the loose stuff off and tig weld it, it’ll be fine!

          Comment


          • #6
            What a mess............Yes on the anodes. Good Idea also if your running Copper service water lines between the house and meter..

            Comment

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