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Old 07-27-2010
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I think it is cast aluminum, as is common with many masts including mine. The deckbase is probably aluminum as well or one of them would be totally destroyed by now. Welding might make sense if it can be done without distortion, by someone who welds aluminum regularly.

ps No mast is watertight from the top I don't think.
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Hairline crack on mast-deckbase.jpg   Hairline crack on mast-mastbase.jpg  
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Old 07-27-2010
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Welding is the simplest solution, any tapered mast is welded, it is a very common practice. You do need someone who knows what they are doing of course.

Good Luck
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Old 07-27-2010
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I agree that no mast is watertight.

I'm wondering where the dissimilar metal interface is occuring because ... with a steel ship and an aluminum mast it has to be happening somewhere. The photos show the remnants of some sort of enamel coating on the interior of the mast step. Maybe the step is steel and the insert is aluminum. Either way ... if the mast step insert is aluminum as well as the mast itself ... it is rather bizarre for alumina to be building up so aggressively. It should form a hard passivation layer and cease. Maybe ... there has been sufficient motion between the mast and insert to continually form, remove, and re-form aluminum oxide at that interface. I'd like to know whether the damaging corrosion is reduction on the insert or mast.
1981 C&C 32
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