Annual maintenance consists of repairs to the
hull, engine, bearings, fittings, bilge pumps, electrics, plumbing,
electronics, safety gear, paint, rails, glass, decking, prop...you
name it...if it's busted, it gets fixed. Needless to say, this can
run into some big buck$, but it has to be done. Good maintenance
can make the difference between getting back home or ending up on
the bottom. At sea in cold Atlantic waters, the boat is life.
Why paint a fiberglass hull? It's not just for
cosmetic reasons. The paint contains copper which discourages the
growth of marine organisms (algae, barnacles, etc.) on the hull.
The U.S.S. Constitution has a copper-clad hull, originally flayed
on by none other than Paul Revere (or more accurately, as was
pointed out by a reader, by one of the many companies he owned).
What keeps the metal parts that are constantly
under water from corroding? Seawater is essentially a solution of
salts, and as such, it is an electrolyte. When metals are placed in
this solution, electrochemical reactions occur that cause them to
corrode. In general, more electronegative metals corrode faster
than more electropositive metals. It is possible to protect an
alloy (steel) from corrosion by placing it in contact (either
directly or via a conductive wire) with a more electronegative
conductor (zinc).
|