Cathodic protection in a storage tank is?

Cathodic protection in a storage tank involves using a small electric current to mitigate the processes that lead to rust, corrosion, and pitting of metal surfaces. This method is particularly important for protecting metal tanks that store water or other substances, as it helps maintain the integrity of the tank structure over time.

The principle behind cathodic protection is based on electrochemistry, where the metal structure (the anode) is protected by being made the cathode in an electrochemical cell. By doing so, the electrochemical reactions that would typically lead to corrosion are inhibited, effectively extending the lifespan of the storage tank. This is essential for ensuring safe water storage and minimizing maintenance costs.

The other options pertain to different functions that do not align with the specific action of cathodic protection. Increasing water flow, enhancing water taste, or controlling water temperature do not relate to the key aspect of preventing metal degradation, which is the primary purpose of cathodic protection.