Impressed current uses external power to force current to flow from the anode to the structure through which medium?

Impressed current cathodic protection (ICCP) is a technique used to prevent corrosion on metal surfaces, particularly in similar environments such as pipelines and storage tanks. In this system, an external power source provides the energy necessary to drive current from the anode (the sacrificial component) to the metal structure that is being protected, which is typically the cathode.

The medium through which this current flows is the electrolyte, which can consist of moisture, soil, or any other conductive liquid or gel that allows for ionic movement. The electrolyte is crucial in the cathodic protection process because it completes the electrical circuit between the anode and cathode, enabling the flow of current necessary to inhibit corrosion. The current effectively transforms the metal structure into a cathode, reducing the electrochemical reactions that lead to corrosion.

In short, the electrolyte is the primary medium that facilitates the flow of impressed current from the anode to the structure, making it essential for effective cathodic protection in various applications.