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

[John Birch]

I smiled, it was a good analogy ; )


----- Original Message ----- 
From: "Gordon Laco" <mainstay at csolve.net>
To: "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org>
Sent: Monday, March 26, 2012 6:01 PM
Subject: Re: [Public-List] Sail track rivets on mast - SS Machine screws


> 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 



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