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

Gordon Laco mainstay at csolve.net
Mon Mar 26 15:01:18 PDT 2012 

And the pedestrian stainless steel rivets lasted many decades....

Gord #426 Surprise

PS - so nobody attacked me for my zipper analogy??


On 26/03/12 5:42 PM, "John Birch" <Sunstone at cogeco.ca> wrote:

> 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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>>>>>> 
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>>>> 
>>>> 
>>>> 
>>>> --
>>>> Jeffrey Fongemie
>>>> _______________________________________________
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>> 
>> 
>> -- 
>> Jeffrey Fongemie
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> 
> 
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