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Zinc anodes has been used as a sacrificial anode material in seawater since 1824, when Sir Humphery Davy used zinc blocks to prevent corrosion of the copper cladding on the hulls of British warships.
Modern zinc anodes used for cathodic protection are cast from high purity zinc (99.995 %) alloyed with aluminium and silicon to combat impurities and cadmium to give uniform dissolution with loose dispersible corrosion products.
The most widely used specification for zinc anodes is US Mil Spec 18001J are the most widely used, for cathodic protection. Composition
Elementss
Standard (Wt. %)
High purity Wt. %
Copper
0.005 max
0.002 max
Iron
0.005 max
0.0014 max
Cadmium
0.025 - 0.07
0.003 max
Lead
0.006 max
0.003 max
Others
0.10 max
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Zinc
Remainder
Remainder
Zinc anodes of other compositions are also manufactured by us to suit individual requirements.
Characteristics
Open circuit potential Vs Ag/AgCl - -1.05 V
Capacity - 780 A
Zinc anodes perform reliably in water and mud with resistivities up to 1000 Ohm cm and have a driving potential of 250 mV against protected steel at normal ambient seawater temperatures. This driving potential reduces as the temperature rises and zinc should not be used where temperatures above +50 Deg C are likely to occur.
Marine Corrosion Specialist
Rajesh Metal Syndicate Manufacturers / Exporters / Suppliers & Stockist of Zinc Hull Anodes, Aluminium Hull Anodes, Zinc Tank Anodes, Aluminium Tank Anodes, Zinc Rod, Zinc Pencil, Zinc Strip, Zinc Engine Anodes, Gun Metal & P. Bronze Castings, Brass Plugs, Stainless Steel Pipes, Stainless Steel Shafts Etc.
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