How do they stop ships from rusting?

Answer 1

The answer is simple.. special coatings..

And you cant simply use stainless steel for a hull, for two reasons.. one being it is unbelievably expensive compared to steel, and stainless steel is more dense.

Answer 2

The hull of ships and legs of oil rigs which would rust rapidly are protected by sacrificial methods, using more reactive metals like zinc and magnesuim that are bolted onto the iron. Asthis corrodes it is replaced but as long as some remains the protection is effective. The hull does not need to be covered but just blocks placed every yard or so. Hope this helps.

Answer 3

Large ships are protected from corrosion by using a "sacrificial" metal. Commonly called the Zincs, this block of metal is attached to the ship, and is more prone to corrosion than the steel of the ship. Connected by an electrical bond, over a period of time, it is eaten away, and must be replaced. This technique is also used to protect bridges, pipelines, water tanks- and is probably present inside the water heater in your home. The zinc becomes the anode, and the hull of the ship is the cathode.

Answer 4

Hot dip galvanize the steel is one method. This is a form of sacrificial anode cathodic protection. In addition, blocks of a more active metal such as aluminum, magnesium or zinc or alloys of these can be attached to the ship. These metals sacrifice themselves becoming the anode and making the ships hull the cathode, and protecting it in the process. Painting is also a good idea. It is also possible to pass an impressed current through the ships hull (low voltage) and this will protect the ship by ICCP - Impressed Current Cathodic Protection. In practice, a combination of methods is used. The usual one is a coating plus cathodic protection.

Answer 5

There is some flaking and minor surface rusting on the northwestern side of the bridge, where paint has broken down due to environmental exposure," an RTA spokesman said after seeing photos taken by The Daily Telegraph.

The government said it spends about $15 million a year on routine maintenance of Sydney Harbour Bridge's structure alone and, yes, the paint job continues.

About 485,000sq m of steelwork - the equivalent of 60 football fields - needs to be painted.

It takes 30,000l of paint for just one coat of the Harbour Bridge.

Answer 6

They either use non-corrosive material or use a special spray probably.

Answer 7

If a boat has a steel hull, then the hull would be carefully painted to prevent rust. If the hull is not steel, then it isn't going to rust. Aluminum boats never rust.