Silicon bronze fasteners with SS parts

Discussion in 'Materials' started by MJT, Jul 2, 2020.

  1. MJT
    Joined: Jul 2012
    Posts: 32
    Likes: 1, Points: 8, Legacy Rep: 10
    Location: North Kingstown, RI

    MJT Junior Member

    Hi All:

    I'm about to put the hardware back on my wooden masts. Much of the hardware is stainless steel, and I'm wondering if there's a reason to avoid using silicon-bronze fasteners.

    Example: Silicon bronze fasteners in stainless cleats or winches
     
  2. bajansailor
    Joined: Oct 2007
    Posts: 3,599
    Likes: 1,561, Points: 113, Legacy Rep: 37
    Location: Barbados

    bajansailor Marine Surveyor

    Is it possible that some of your hardware could be chrome plated bronze, rather than stainless steel?
     
  3. hoytedow
    Joined: Sep 2009
    Posts: 5,857
    Likes: 400, Points: 93, Legacy Rep: 2489
    Location: Control Group

    hoytedow Carbon Based Life Form

    I would use stainless steel fasteners for attaching stainless fittings and bronze fasteners for attaching bronze fittings.
     
  4. trip the light fandango
    Joined: Apr 2018
    Posts: 505
    Likes: 104, Points: 43
    Location: Rhyll Phillip Island Victoria Australia

    trip the light fandango Senior Member

    The galvanic scale is why you need to stick to like as hoytedow says. Strangely the silicone bronze is more likely to react and lose integrity before the 316 stainless even though it is higher up the scale, I suppose it is because the stainless is harder?? I must have that wrong. So I checked the galvanic scale and the difference means your fastenings will go before the 316 stainless. If you are careful and use something with an insulating property like plastic washers and or the right grease, they may outlast you.
     
    Last edited: Jul 5, 2020
  5. sdowney717
    Joined: Nov 2010
    Posts: 1,175
    Likes: 85, Points: 58, Legacy Rep: 274
    Location: Newport News VA

    sdowney717 Senior Member

    only downside with ss is crevice corrosion, in all other aspects superior to bronze. IMO. up on a mast that kind of corrosion is less likely as it is not constantly wet.
    if the bronze bolts and whatnot are in good shape, keep using them.
     
    Will Gilmore likes this.
  6. TeddyDiver
    Joined: Dec 2007
    Posts: 2,614
    Likes: 136, Points: 73, Legacy Rep: 1650
    Location: Finland/Norway

    TeddyDiver Gollywobbler

    Concur!
     
  7. Will Gilmore
    Joined: Aug 2017
    Posts: 939
    Likes: 434, Points: 63
    Location: Littleton, nh

    Will Gilmore Senior Member

  8. MJT
    Joined: Jul 2012
    Posts: 32
    Likes: 1, Points: 8, Legacy Rep: 10
    Location: North Kingstown, RI

    MJT Junior Member

    Absolutely.

    Thanks all for the replies.

    What bedding compound, if any, is recommended for screws in wooden spars? I've used Dolphinite.
     

  9. Rob Lehmann
    Joined: Feb 2021
    Posts: 2
    Likes: 1, Points: 3
    Location: Newport, RI

    Rob Lehmann New Member

    For alloys that are commonly used on boats, and for use in a seawater (or any water for that matter) environment, here is a good galvanic chart to refer to. 316 Stainless and Silicon Bronze shouldn't be in contact.
     
    hoytedow likes this.
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.