In the corrosion electrical circuit, which metal consumes the electrons produced by the corrosion reaction?

In a corrosion electrical circuit, the metal that consumes the electrons produced by the corrosion reaction is the cathode. The cathode is where reduction occurs, and it gains electrons during the corrosion process. This typically happens when the anode (the part of the metal that is corroding) reacts with the electrolyte, generating electrons. These electrons then flow through the external circuit to the cathode, where they are used in reduction reactions.

This process highlights the roles of the anode and the cathode in a corrosion cell: the anode loses metal through oxidation, producing electrons, while the cathode receives those electrons and undergoes a different electrochemical reaction, often leading to a gain in mass or the protection of that portion of the metal. Understanding this mechanism is fundamental for preventing and managing corrosion in aerospace and other applications, as it helps in choosing appropriate materials and protective measures.