Cathodic Protection Tester Practice Exam

What is the primary role of the anode in an electrochemical corrosion cell?

1. To attract positive ions

2. To repel electrons

3. To oxidize metal ions

4. To reduce metal ions

The correct answer is: To oxidize metal ions

The primary role of the anode in an electrochemical corrosion cell is to oxidize metal ions. In this context, oxidation refers to the process where metal loses electrons and is transformed into metal ions. When metal is corroding, it serves as the anode, and during this reaction, it releases electrons into the environment, which is essential in understanding how corrosion occurs. At the anode, the metal atom undergoes oxidation, resulting in the formation of positively charged metal ions. These metal ions are then released into the electrolyte. This process is fundamental to the corrosion mechanism, as it initiates the electrochemical reactions that lead to the degradation of the metal. Thus, the statement that the anode's main function is to oxidize metal ions accurately reflects its role in the electrochemical process responsible for corrosion.