A special place in HELL for those who.... - SailNet Community
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post #1 of 7 Old 04-06-2013 Thread Starter
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A special place in HELL for those who....

put SS fasteners in Aluminum w/o TEFGEL et al.

Since my mast is down I've been doing all sorts of cool (expensive) things to it. New halyards, LED Tri/anchor, etc. Thought I'd better look at the spreader tips and sure enough the SS screws had that telltale white powdery dust that can only come from electrolysis in Aluminum. Damn people who don't use some kind of dielectric grease in these applications.

Almost as bad as those who use 5200 on things that you may want to take apart later.
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CS 36M DIANTHUS
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post #2 of 7 Old 04-06-2013
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Re: A special place in HELL for those who....

Don't blame them! Back when they put those screws in, rain was less acidic, so the electrolysis (if any) was less pronounced and took much longer to occur than it does now. How could they have known how bad it would get? Besides, why would you want to ever change your spreader tips? They probably didn't have 5200 when they built the boat, and were maybe COUNTING on electrolysis to make sure nothing ever got loose up there. Their way of trying to save future owners any hassle or additional costs without relying on futuristic goop.
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post #3 of 7 Old 04-07-2013
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Re: A special place in HELL for those who....

Actually acid rain 30 years ago was worse than now and they knew about the potential problem. I just think that it never occurred to them that people would want to take it apart so far in the future.

Back home on Lake Ontario after something over 36,000 nm circumnavigator. Not surprisingly there is a lot of stuff I want to get done on Ainia both cosmetically and functionally. Getting an early start so it will be ready to go for next summer (Lake Superior?).
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post #4 of 7 Old 04-07-2013
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Re: A special place in HELL for those who....

Ask Maine or Boat Poker - Production boats, mass (for sailboats anyway) commissionings, preventative maintenance was not among many builder's priorities then, maybe not now.
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post #5 of 7 Old 04-07-2013
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Re: A special place in HELL for those who....

I had the same problem when we had our mast down. Some of the bolts were so badly corroded that I had to twist them apart just to get them out. That took a lot of effort to say the least. We only replaced a few at the time, our mast is coming down again in the fall to replace all of them and put corrosion inhibitors on everything (I didn't know about them at the time I replaced the last few).

OTOH a few came out pretty easily and didn't show significant signs of corrosion aside from a small ring of white around where the bolt was in the mast. I'm not sure if this means they used something to inhibit corrosion or if it's just coincidence, but it definitely seemed like some areas were more prone to corrosion than others.

The one I had a particular problem with was the sheave bolt, which was actually frozen in place and covered in some kind of salt residue. I had to break the bolt out of the masthead and knock the sheaves out. Almost all the boats in the masthead were in the same type of state.

The bolts in the mast itself were a different story though. We replaced the bolts holding the upper shrouds and I could hammer them both out without a problem.

It makes me wonder why one area was so difficult but not the others. My assumption was that the saltwater in the masthead came from wet halyards and everything there was more exposed to corrosion as a result. I'd love a better explanation if anyone has one, though.

Last edited by Shinook; 04-07-2013 at 09:17 AM.
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post #6 of 7 Old 04-07-2013 Thread Starter
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Re: A special place in HELL for those who....

Quote:
Originally Posted by rugosa View Post
Ask Maine or Boat Poker - Production boats, mass (for sailboats anyway) commissionings, preventative maintenance was not among many builder's priorities then, maybe not now.
Yeah, I know. And the fact of the matter is it has lasted this long. (although it does look like some of them have been replaced) The originals were just short little self tapping SS screws. I guess I should be glad that the build quality on CS boats is such that even at 23 years of age the boat is in pretty good condition.

CS 36M DIANTHUS
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post #7 of 7 Old 04-07-2013
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Re: A special place in HELL for those who....

Rust, the poor man's Loctite.

Actually, one reason the Japanese ate Detroit's lunch was because they specified some type of coating, either a lock or an antiseize, on almost every threaded part in the cars. And as a result didn't have a thousand squeaks and rattles and loose nuts.

Detroit caught on, begrudging the expense, a bit too late.
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