The commonly used anode types for cathodic protection include magnesium anode, zinc anode, and aluminum anode.
Magnesium anode
Magnesium anodes are widely used in various environments, including high resistivity soils or freshwater environments, due to their high activity. The advantages of magnesium anode include strong adaptability, can be used in most environments without producing harmful cations, and is suitable for drinking water tanks and water heaters. However, the self corrosion of magnesium anodes is severe, the current efficiency is not high, the price is high, and the usage cost is high.
Zinc anode
Zinc anodes are widely used due to their stable electrical performance and excellent anti-corrosion effect. Zinc anodes are suitable for steel structures such as ships, port facilities, marine engineering, buried metal pipelines, and storage tanks. The electrical performance of zinc anodes includes parameters such as theoretical anode efficiency, theoretical capacitance, utilization coefficient, and open circuit potential.
Aluminum anode
Although aluminum anodes can theoretically be used as sacrificial anodes, a passivation film will form on their surface, affecting electrochemical reactions. By adding trace metal elements such as zinc, indium, etc., the formation of passivation film can be prevented and the initial activation effect can be achieved. Aluminum anodes are suitable for use in seawater and other media containing chloride ions, with good performance, and are suitable for cathodic protection of ships, machinery and equipment, marine engineering and harbor facilities, as well as pipelines in sea mud.
Flexible anode
Cathodic protection flexible anode is a special anode material, usually composed of conductive polymer, metal core wire, and outer cladding. Flexible anodes have better flexibility and adaptability, and can evenly distribute current on the surface of complex shaped metal structures, providing more comprehensive and effective cathodic protection. Flexible anodes are suitable for complex environments such as pipeline cathodic protection and tank bottom plate protection.
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