Science behind the magic

Cathodic Protection reduces the corrosion of metal surfaces by making the steel surface the cathode of an electro-chemical cell by using either a galvanic sacrificial anode, usually an electrochemically active alloy such as aluminium, zinc or magnesium, or by using an impressed current system.

The sacrifical system is usually more expensive due to the cost of the galvanic anodes used. However, since galvanic anode systems require no external source of power and are relatively easy to install and maintain, they are becoming more attractive, according to MCPS Ltd. The fact that aluminium prices are falling is making the solution even more attractive. Compared to zinc anodes, aluminium alloy anodes have a higher electrochemical efficiency which enables them to operate at different temperature co-efficients. The anodes are less dense than zinc making them lighter and easier for handling when fitting and systems based on this technology can also be designed to protect the uncoated steel on older installations.

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