What is meant by Cathodic protection of the Iron? Explain it taking the example of Magnesium attached to an Iron tank or pipe.

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

In the process of cathodic protection of Iron, Iron metal is connected with a more reactive metal such as Magnesium, the two metal acts as two separate electrodes. The more reactive metal Magnesium will act as anode whereas Iron will act as cathode in this set up. In this set up magnesium will be oxidized and at the cathode (Iron rod) the reduction of oxygen to hydroxide ions will take place. In this process as long as we have magnesium, Iron will not oxidize.

Answered by  | 4th Jun, 2014, 03:23: PM

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