http://www.corrintec-marine.com/document_1/corrintec-fastferries.pdf
A little info on anti-corrosion for these vessels............
Austals built a Fast Ferry for New York at the same place building for the U.S. Navy. The buyer rejected the boat because of problems with the Ferry. I was working at another yard and we pulled it out of the water for repairs.
The Hull was pitted from bow to stern. I'm not kidding.
They didn't have a clue on how to isolate the electrical on that Ferry. We isolated and made repairs on the Hull.
These are the same dolts building the U.S. Navy vessels now, which make it no surprise to me that this happened on the Independence.
It says here they dropped the "Cathodic Protection System" to save money.
And don't try to blame this on a liberal...we were off doing our arts and crafts
..."Independence‘s corrosion is concentrated in her water jets — shipboard versions of airplane engines — where steel “impeller housings” come in contact with the surrounding aluminum structure. Electrical charges possibly originating in the ship’s combat systems apparently sparked the electrolysis.
ItÂ’s not clear why Austal and the Navy didnÂ’t see this coming. Austal has built hundreds of aluminum ferries for civilian customers. The Navy, for its part, has operated mixed aluminum-and-steel warships in the past.
But Independence — the Navy’s first triple-hull combatant — could be a special case for both the builder and the operator. For all Austal’s chops building civilian ferries, the Australian company is new to the warship business. Austal set up shop near Mobile in 1999. Today, the shipyard has contracts to build 10 LCS, plus several catamaran transports for the Navy.
From the NavyÂ’s point of view, Independence and the other Littoral Combat Ships are unique. As in, uniquely cheap. Each vessel is supposed to cost just $400 million, compared to more than a billion bucks for a larger, all-steel Arleigh Burke-class destroyer.
Lots of things — major weapons, for one — have been left off the LCS in order to keep the price down.
The list of deleted items includes something called a “Cathodic Protection System,” which is designed to prevent electrolysis.
Independence will get the protection system installed at the first opportunity, and future LCSs will include it from the beginning, according to Pritchett.