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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. They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive oxidation potential ) than the metal of the structure.
The usual technique for concrete buildings, bridges and similar structures is to use ICCP, [30] but there are systems available that use the principle of galvanic cathodic protection as well, [31] [32] [33] although in the UK at least, the use of galvanic anodes for atmospherically exposed reinforced concrete structures is considered experimental.
The galvanic series (or electropotential series) determines the nobility of metals and semi-metals. When two metals are submerged in an electrolyte, while also electrically connected by some external conductor, the less noble (base) will experience galvanic corrosion. The rate of corrosion is determined by the electrolyte, the difference in ...
A common example of galvanic corrosion occurs in galvanized iron, a sheet of iron or steel covered with a zinc coating. Even when the protective zinc coating is broken, the underlying steel is not attacked. Instead, the zinc is corroded because it is less "noble". Only after it has been consumed can rusting of the base metal occur.
For galvanic CP systems, the anode material corrodes under the influence of the steel, and eventually it must be replaced. The polarization is caused by the current flow from the anode to the cathode, driven by the difference in electrode potential between the anode and the cathode. The most common sacrificial anode materials are aluminum, zinc ...
Electrogalvanizing is a process in which a layer of zinc is bonded to steel to protect against corrosion, enhance adhesion, or give an aesthetic appeal.The process involves electroplating, running a current of electricity through a saline-/zinc-based electrolytic solution with a zinc anode and steel cathode.
Battery materials company Vianode has secured a deal with General Motors Company (NYSE:GM) to supply high-performance anode graphite solutions. The master supply agreement, which has a multi ...
Tractor Supply Company (also known as TSCO or TSC), founded in 1938, is an American chain store that sells home improvement, agriculture, lawn and garden maintenance, livestock, equine and pet care equipment and supplies. It caters to farmers, ranchers, pet owners, and landowners.