NACE CP1 Tester Practice Exam

Cathodic protection is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. This method works by supplying electrons to the structure that requires protection, which effectively reduces its tendency to corrode. Therefore, the gain of electrons is a fundamental principle of cathodic protection, as it helps counteract the electrolytic reaction that leads to corrosion, thus preserving the integrity of the metal structure.

In this process, either a sacrificial anode (which corrodes instead of the protected metal) or a impressed current system (which supplies external current) is used to ensure that the structure becomes the cathode in the electrochemical reaction. This modification in the electrochemical environment is crucial for preventing deterioration due to corrosion.

Understanding this fundamental concept is essential for anyone studying cathodic protection, as it highlights the mechanism through which corrosion can be mitigated, ensuring structures remain safe and functional over their expected lifespan.