|
Stainless steel is an alloy that contains at least 50% iron and
10% chromium. The chromium inhibits corrosion - the more chromium, the more corrosion resistance up to a maximum of
about 30%.
Type 304 stainless is widely used for rigging, fasteners, and fittings.
Most of the stainless produced today is type 304, also called 18-8 because it's made of 18% chromium and 8% nickel.
By adding more nickel and 2% molybdenum to 304 stainless, you get Type 316, which has the best corrosion resistance among
standard stainless steels. It resists pitting and corrosion by most chemicals, and is particularly resistant to saltwater
corrosion.
When stainless steel is produced, the chromium forms an outer oxide
layer. As long as that layer remains intact, the stainless remains passive. To prevent corrosion, the passivated
stainless steel is immersed in a heated bath of phosphates and salts. This solution forms an oxide film that seals off
the iron, preventing it from going into solution in water. Once the oxide layer begins to break down, the stainless
steel becomes active and its corrosion resistance is reduced. Rust is the visible evidence of corrosive activity.
(2007 Port Supply catalog, p.1090)
 The lifespan of standing rigging on the Upper Chesapeake Bay is
10-15 years. Keep in mind that even when you're not sailing your boat, as long as the mast is up, the rigging is under
load and the "lifespan clock" is ticking. We recommend leaving your wire, swages, and turnbuckles uncovered (no tape,
turnbuckle boots, or wire covers), and taking a close look at your rigging every Spring to check for cracks, broken wire strands,
and heavy rust. A crack can be hard to spot (often no bigger than a strand of hair) - a magnifying glass will help.
Walden Rigging uses only the highest quality 316 stainless
steel wire. We offer the best fittings available, including swaged and mechanical fittings (like Sta-Lok) and chrome
bronze open body turnbuckles.
The best maintenance is prevention. Rinse your boat, including
the rigging at deck level, after sailing. Check your rigging on an annual basis for signs of stress and aging.
Plan ahead for your next re-rig and do it BEFORE things start to fail. You'll be making a worthwile
investment in your boat and in your continued enjoyment of sailing. If you'd like a quote on replacing your standing
rigging, please give us a call.
|
