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Thread: Alloy boats and dissimilar metals

  1. #1
    dog chaser distant stalker's Avatar
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    Alloy boats and dissimilar metals

    I'm doing a bit of work on the boat that required more fixtures, wondering what others do to prevent dissimilar metals causing electrolysis i.e stainless bolts, I'm sure a few on here will have had a bit of experience with this stuff.

  2. #2
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    I made plastic bushings for where S/S bolts went through the aluminium. For things like the transducer screws into the transducer bracket, I greased them, and removed and clean each year.
    Be sure not to use any copper or brass fittings directly against the aluminium.
    distant stalker likes this.

  3. #3
    dog chaser distant stalker's Avatar
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    I'll be painting holes where can't get plastic washers in, hoping that's enough to prevent issues

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    We used a Teflon Gel (barrier) that was applied with a paint brush that basically eliminated any galvanic issues.
    Might pay to see if something is available at a marine shop!?
    SS and aluminium are reasonably compatible.
    It's the alloying ingredients (alloy's) in the aluminium/SS that exacerbates issues.

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    The salts just as bad

  6. #6
    Lovin Facebook for hunters kiwijames's Avatar
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    Quote Originally Posted by Fireflite View Post
    We used a Teflon Gel (barrier) that was applied with a paint brush that basically eliminated any galvanic issues.
    Might pay to see if something is available at a marine shop!?
    SS and aluminium are reasonably compatible.
    It's the alloying ingredients (alloy's) in the aluminium/SS that exacerbates issues.
    @Fireflite. I think we used a similar product when I was marine in the US. It was a product called Tef-gel. It is absolutely awesome. Lots of S/S fittings into aluminium were coated in this This stuff
    The range of what we think and do is limited by what we fail to notice. And because we fail to notice that we fail to notice, there is little we can do to change; until we notice how failing to notice shapes our thoughts and deeds

  7. #7
    Throbbing Member Dorkus's Avatar
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    I just used a layer of silicon gell between the stainless washer and any alloy
    tetawa likes this.
    “The society that separates its scholars from its warriors will have its thinking done by cowards and its fighting by fools.” - Thucydides 463BC

  8. #8
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    copper cote?

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    tighten up screws and bolts to make sure everything fits then undo one bolt or screw at a time then cover them in neutral cure silicon and retighten,flush screws or bolts put another smear of silicon over them when first lot has set.

  10. #10
    Member Marty Henry's Avatar
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    Def not coppercote!
    veitnamcam, Beaker and Mathias like this.

  11. #11
    dog chaser distant stalker's Avatar
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    Quote Originally Posted by kiwijames View Post
    @Fireflite. I think we used a similar product when I was marine in the US. It was a product called Tef-gel. It is absolutely awesome. Lots of S/S fittings into aluminium were coated in this This stuff
    Thanks for that I see jaycar are local stockists

  12. #12
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    Quote Originally Posted by Marty Henry View Post
    Def not coppercote!
    depends if its his boat or someone he doesn't like.
    veitnamcam, mikee, Beaker and 2 others like this.

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    Member Gapped axe's Avatar
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    Berg243 has the berries
    "ars longa, vita brevis"

  14. #14
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    Quote Originally Posted by Markgibsonr25 View Post
    copper cote?
    NOOOOO

    don't add copper coat if you have aluminum alloy.
    veitnamcam likes this.

  15. #15
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    Quote Originally Posted by Markgibsonr25 View Post
    copper cote?
    Break a mercury thermometer in the bottom to. ......

    No don't use anything with copper in it as a barrier agent.
    Please excuse spelling, as finger speed is sometimes behind brain spped........ Or maybe the other wayy.....

 

 

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