World of warship aim assist 0.152/19/2024 However, a side effect of cathodic protection was the increase in marine growth. Sacrificial anodes made from iron attached to the copper sheath of the hull below the waterline dramatically reduced the corrosion rate of the copper. The first application was to HMS Samarang in 1824. Another common application is in galvanized steel, in which a sacrificial coating of zinc on steel parts protects them from rust.Ĭathodic protection can, in some cases, prevent stress corrosion cracking.Ĭathodic protection was first described by Sir Humphry Davy in a series of papers presented to the Royal Society in London in 1824. Common applications are: steel water or fuel pipelines and steel storage tanks such as home water heaters steel pier piles ship and boat hulls offshore oil platforms and onshore oil well casings offshore wind farm foundations and metal reinforcement bars in concrete buildings and structures. For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current.Ĭathodic protection systems protect a wide range of metallic structures in various environments. The sacrificial metal then corrodes instead of the protected metal. A simple method of protection connects the metal to be protected to a more easily corroded " sacrificial metal" to act as the anode. Zinc sacrificial anode (rounded object) screwed to the underside of the hull of a small boat.Ĭathodic protection ( CP / k æ ˈ θ ɒ d ɪ k/ ( listen)) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. Corrosion prevention technique Aluminum sacrificial anodes (light colored rectangular bars) mounted on a steel jacket structure.
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