What is the discharge mechanism of a galvanic anode?

The discharge mechanism of a galvanic anode involves the active transfer of electrons. In cathodic protection systems, galvanic anodes are made from metals that are more reactive than the metal they are protecting, commonly used to prevent corrosion. When the anode is connected to the cathodic structure, this more reactive metal oxidizes, releasing electrons into the circuit. As the anode corrodes, it provides a continuous flow of electrons to the cathode, thereby protecting it from corrosion. This active transfer of electrons is crucial to the electrochemical reactions that occur in these systems.

This choice accurately describes how galvanic anodes function within cathodic protection. The other options do not closely relate to the fundamental process happening at the anode. For instance, while some current absorption might occur in an electrical context, it does not define the operation of a galvanic anode. The generation of heat could theoretically occur due to resistive losses during the electrochemical process but is not a characteristic mechanism of anode discharge. The discharge of ions is a different process related to the electrolyte movement but does not capture the essence of electron transfer that defines the operation of galvanic anodes.