[Alberg30] Stainless Corrosion

[Wally Moran]

Crevice corrosion starts when you have water but no air if I remember 
correctly.  So, eliminate the water or provide air. If you can see 
corrosion, the big danger is what is hidden at the microscopic level, 
ready to break under stress.
Don't be cheap, replace the bolts, there is no safe way to stop it. 
Make sure you rebed the bolts properly, overdrilling the holes and 
refilling them with epoxy, then drilling to size and using a suitable 
bedding compound. That eliminates the water. By the way, if there is 
water in the deck causing corrosion, what sort of shape is your core 
in? Have you checked?
Here is what Calder says: "...if stainless steel is used in an area 
where stagnant water can collect, sooner or later its passivity (me: 
resistance to corrosion) will break down and it will become active 
(normally in isolated pinholes and crevices)", page 135, Boatowner's 
Mechanical and Electrical Manual.
Good luck...

Wally Moran

>Does anyone know a way to avoid crevise corrosion in stainless steel 
>bolts going through a deck?
>Once the corrosion starts, is there anyway to stop it, short of 
>replacing the bolts? (I'm being cheap here, but want to be safe. the 
>bolts in question hold my mast step to the deck. 1/2"D X ~6" long 
>and definately show corrosion)
>Thanks for any input,
>Brian


-- 
The gods do not deduct from man's allotted span the hours spent in 
sailing. Anon
www.georgianbaysailing.ca for interesting reading for sailors
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