Mast Corrosion Repair - SailNet Community
 
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post #1 of 6 Old 04-15-2007 Thread Starter
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Mast Corrosion Repair

In Panama -- stowed Isomat mast on wooden blocks - got hand-sized area of corrosion, one dime-sized spot almost all the way through the side of the mast. Tayana 37 with Isomat NG 70 section. Have only a few days to make repair before must step & launch boat. Spot is up between the spreader and the forestay ftting, so repair while stepped (which may be necessary) will be a bear.

Any suggestions?

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post #2 of 6 Old 04-15-2007
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OldGuyFlier-

Generally, unless the mast is stored indoors, leaving it on wooden blocks can be a really bad way to store it. Wood tends to trap moisture up against the mast and make a localized corrosion cell. Happens more to stainless than aluminum, but any place the two are mixed, you can have some serious problems.

It might be worth making a partial sleeve to go around the damaged area and then either screwing it or riveting it to the mast.

If you decide to use stainless steel fasteners, makes sure that they are coated with either TefGel, Lanocote or some other compound to help isolate the two metals.

Also, might be worth filling the slight space between the sleeve and mast with 3M 5200. This will add strength to the repair as well as seal out water.

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Ditto SD's advice but I would make a separate plate about 2/3 around the diameter of the mast rather than a full sleeve which will be harder to fit. Plate should be well in excess of the size of the damaged areas and rivet them in place using the same procedures SD suggests.
Alternatively you can cut the mast in two removing the corroded spot in the process...then fabricate an internal tube and re-assemble the mast around it using rivets to do the joining. This is the preferred method but is a lot more complex a project given your time frame.
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Cam-

I did say partial sleeve.. I agree that the internal sleeve is preferred, and far less likely to chafe halyards and such...but it takes a good deal longer to properly fabricate and install one.

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Sorry SD...speed reading gets me in trouble!

Never mind!
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Quote:
Originally Posted by camaraderie
Sorry SD...speed reading gets me in trouble!

Never mind!
LOL,, and I thought it was the hearing that went at your age

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—Cpt. Mal Reynolds, Serenity (edited)

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