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Stainless Welding, first attempt

Discussion in 'Day Sailers' started by Shorefun, Jan 12, 2019. Add this thread to a FAQ

  1. CYQK

    CYQK

    Joined Sep 11, 2009
    349 posts, 15 likes
    beneteau first 42
    US kenora
    Went by my local Praxair dealer yesterday and asked for passivationpaste he looked at me like i was speaking jiberish?
    Easy place to buy the stuff???
    Thks
     


  2. JimInPB

    JimInPB

    Joined Aug 22, 2017
    1,350 posts, 399 likes
    Hunter 212 & 170
    us West Palm Beach
    Yea, some guys never heard of pickeling past or passivation acid.

    West Marine used to carry Wichinox, which was an overpriced version of that stuff with a little polishing compound mixed in. If you are lucky, you might find some old stock still sitting on the shelf at one of their locations. They seem to have discontinued carrying it. https://www.westmarine.com/buy/wichard--wichinox-stainless-steel-polish--367641 Fishery Supply no longer carries it either.

    I now see that Defender seems to have picked up a gel version - https://www.defender.com/product.jsp?id=4693998

    The Defender page says that it contains phosphoric acid. I seem to remember that Coca-cola has some of that too. I wonder if Coke would work?
     


    Last edited: Jan 22, 2019
  3. JimInPB

    JimInPB

    Joined Aug 22, 2017
    1,350 posts, 399 likes
    Hunter 212 & 170
    us West Palm Beach
    When you cut or weld stainless, you bring the whole alloy into contact with the surrounding atmosphere. Any ferrous components of the alloy are then free to rust. Passivizing the surface with acid or pickling paste, leaches the ferrous components of the alloy from the surface & leave a boundary layer that is resistant to corrosion. Electro-polishing the surface is another option.

    Youtube actually has some good information on stainless & corrosion. This is a decent video to start with -

    This one gives a good overview of the different types of SS families that you may run into.
     


    Will Gilmore likes this.