11311Definitions [9

Anode The electrode of an electrolytic cell at which oxidation is the principal reaction leading to metal ions entering solution, that is, the electrode where corrosion occurs.

Cathode The electrode of an electrolytic cell at which reduction is the principle reaction.

Electrolyte An aqueous ionic conducting substance in which the anode and cathode are immersed. Metallic Path The external circuit that connects the anode to the cathode, permitting the flow of electrons from the anode to the cathode.

A corrosion cell therefore consists of two electronically connected sites (an anodic and cathodic site) in contact with a conducting electrolyte. Figure 11.1 shows that corrosion cells can result from the connection of two metals or from the separation of anode and cathode sites on an individual metal or alloy.

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