[Public-List] Sail track rivets on mast - SS Machine screws

John Birch Sunstone at cogeco.ca
Mon Mar 26 14:42:16 PDT 2012 

Jeffrey, you are correct, monel (also known as cuprinichol) is absolutely 
contra indicated on an Aluminum mast. It is much farther apart on the 
galvanic scale to aluminum than 316 SS

Remember, your sail track is SS ( probably 302 or 304)

SS is the better route for you.

Remember, you are just trying to secure a sail track, not make a battery ; )

Cheers,

John



----- Original Message ----- 
From: "Jeffrey" <fongemie at gmail.com>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: Monday, March 26, 2012 5:30 PM
Subject: Re: [Public-List] Sail track rivets on mast - SS Machine screws


> Welcome Nicki,
>
> Thanks for posting.
>
> As it turns out, Monel rivets are difficult to find here in the US at
> reasonable prices. I found a couple of places selling little packages of
> three monel rivets for $16! McMaster Carr has "Corrosion-Resistant Blind
> Rivets"  made from copper and nickel-copper; not too bad at $6.51 for 10.
>
> After reading more about Monel, I'm questioning that as a solution in this
> case. Wickipedia article claims monel not inert when joined with other
> metals, which would make sense.
>
> "However, because of the problem of
> electrolytic<http://en.wikipedia.org/wiki/Electrolytic>action in salt
> water (also known as Galvanic
> corrosion <http://en.wikipedia.org/wiki/Galvanic_corrosion>), in
> shipbuilding monel must be carefully insulated from other metals such as
> steel. The New York Times of August 12, 1915 published an article about a
> 215 foot yacht, "the first ship that has ever been built with an entirely
> monel hull," that "went to pieces" in just six weeks and had to be
> scrapped, "on account of the disintegration of her bottom by electrical
> action." The yacht's steel skeleton deteriorated due to electrolytic
> interaction with the monel."
> <http://en.wikipedia.org/wiki/Monel#cite_note-4>
>
> -Jeff
>
> Jeff Fongemie
> #116 Seagrass
>
> http://picasaweb.google.com/fongemie
>
>
>
>
>
>
>
> On Mon, Mar 26, 2012 at 1:56 PM, Nicki Crutchfield 
> <nickicrutchfield at mac.com
>> wrote:
>
>> Hello all,
>> My first post after much reading here.
>> Monel is the preferred option here in the UK. It is apparently inert when
>> mixed with aluminium and, though more expensive than aluminium ones, I
>> wouldn't use stainless. Depends if you are in a salt water environment or
>> not. The black goop (whatever it's called) is also the way to.
>> There, I've made my maiden post.:)
>> Kind regards,
>> Nicki.
>>
>> On 26 Mar 2012, at 18:11, Jeffrey <fongemie at gmail.com> wrote:
>>
>> > Thanks John.
>> >
>> > Good idea on using some good with adhesion qualities.
>> >
>> > -jeff
>> >
>> > On Mon, Mar 26, 2012 at 1:07 PM, John Birch <Sunstone at cogeco.ca> wrote:
>> >
>> >> We went 316 SS Machine screws on Sunstone, an A-37, Great Lakes boat.
>> Same
>> >> mast manufacturer, when we did a major overhaul of the rig. Used 
>> >> Sikkens
>> >> 291, now called something else, but the adhesive version. Felt 
>> >> locktight
>> >> might be too corrosive, TefGel being non adhesive at all. Didn't want
>> the
>> >> machine screws to work loose. So far, no problems - the work was done 
>> >> at
>> >> Klacko Spars in Bronte Ontario back in 1997.
>> >>
>> >> Pulled a couple of machine screws to check, after acetoning out the
>> holes,
>> >> no whitish aluminum oxide present, looked like the threads had been 
>> >> cut
>> >> yesterday. Then rebedded them with more Sikkens. None are loose.
>> >>
>> >> Haven't taken the boat offshore in the ocean yet, but given the 
>> >> salinity
>> >> of the upper Chesapeake, I imaging it would be just fine.
>> >>
>> >> Danny Klacko recommended this approach - he does great work and knows
>> his
>> >> stuff.
>> >>
>> >> Hope this is a help
>> >>
>> >> John
>> >>
>> >>
>> >> ----- Original Message ----- From: "Jeffrey" <alberg30nh at gmail.com>
>> >> To: "Alberg 30 Public List -- open to all" 
>> >> <public-list at lists.alberg30.
>> **
>> >> org <public-list at lists.alberg30.org>>
>> >> Sent: Monday, March 26, 2012 12:44 PM
>> >> Subject: [Public-List] Sail track rivets on mast
>> >>
>> >>
>> >> Hi everyone,
>> >>>
>> >>> I need to do something about the main sail track. I know many of the
>> >>> rivets
>> >>> are bad, last season we kept finding rivets heads on the deck!
>> >>>
>> >>> I've read through past messages in the list archives to see what 
>> >>> others
>> >>> have done. I can't decide between hunting down monel rivets, tapping
>> for
>> >>> SS
>> >>> machine screws or just keeping replacing aluminum with aluminum.  I
>> like
>> >>> the idea of ss machine screws but I'm concerned about corrosion even
>> with
>> >>> the use of products like TefGel.
>> >>>
>> >>> Has there been some newly formed consensus on the subject? Anyone go
>> the
>> >>> machine screw route and find it became a problem due to corrosion of
>> the
>> >>> threads in the aluminum holes?
>> >>>
>> >>> -Jeff
>> >>>
>> >>> Jeff Fongemie
>> >>> #116 Seagrass
>> >>>
>> >>> http://picasaweb.google.com/**fongemie<
>> http://picasaweb.google.com/fongemie>
>> >>> ______________________________**_________________
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>> >
>> >
>> > --
>> > Jeffrey Fongemie
>> > _______________________________________________
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>
>
> -- 
> Jeffrey Fongemie
> _______________________________________________
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