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Cathodic protection on ships is often implemented by galvanic anodes attached to the hull and ICCP for larger vessels. Since ships are regularly removed from the water for inspections and maintenance, it is a simple task to replace the galvanic anodes.
Detailed view of a galvanic anode on the hull of a ship The bright rectangular objects on these ship components are galvanic anodes. A galvanic anode, or sacrificial anode, is the main component of a galvanic cathodic protection system used to protect buried or submerged metal structures from corrosion.
However, a side effect of the cathodic protection was to increase marine growth. Copper, when corroding, releases copper ions which have an anti-fouling effect. Since excess marine growth affected the performance of the ship, the Royal Navy decided that it was better to allow the copper to corrode and have the benefit of reduced marine growth ...
Similarly, sacrificial bars of a metal such as aluminium or aluminium alloys can be attached to an oil rig or to the hull of a ship to prevent it from rusting and breaking down. Magnesium may similarly be used on dry land for installations such as pipelines and oil refineries, where its high driving voltage is better for overcoming the ...
The NSC has a steel hull and steel superstructure with steel bulkheads. Ballistic protection is provided for the main gun. The cutter's crew-served weapons can have steel ballistic shields attached for protection. [23] [24] The NSC is equipped with a state-of-the-art damage-control system, that contributes to the ship's survivability. [25]
Corrosion resistance was also improved by the impressed-current cathodic protection system being modified by adding protections to the water-jet inlet tunnel. Adjustments to the Freedom class, starting with LCS-3, saw the stern transom lengthened and buoyancy tanks added to the stern to increase weight service and enhance stability. Plans were ...
Exposed, unprotected steel will corrode much more rapidly than steel covered with this protective layer. Many ships also use sacrificial anodes or an impressed current for additional protection. Empty ballast tanks will corrode faster than areas fully immersed due to the thin - and electo conducting - moisture film covering them.
USS Independence (LCS-2) is the lead ship of the Independence-class of littoral combat ships. She is the sixth ship of the United States Navy to be named for the concept of independence . The design was produced by the General Dynamics consortium for the Navy's LCS program, and competes with the Lockheed Martin –designed Freedom variant .
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