As cathodic protection works, what does the cathode become more?

The correct answer is that the cathode becomes more basic as cathodic protection works. This occurs due to the electrochemical reactions that take place during the process.

In cathodic protection systems, an external current is supplied to the cathode, leading to the reduction reaction of cations in the electrolyte near the cathode surface. As these cations gain electrons, usually hydrogen ions in the case of aqueous environments, they are reduced to form hydrogen gas or other neutral species. The consumption of hydrogen ions increases the pH level of the solution around the cathode, making it more basic.

This higher pH near the cathode results in a more alkaline environment, which reduces corrosion rates and protects the metal structure being safeguarded. The knowledge of how cathodic protection affects pH is essential for understanding the system's effectiveness and designing appropriate protective measures.